Magnetic. And then we just like skipped the lesson and went on to another topic. Electromagnetic. What do you mean, electromagnets? No, I think it's called electromagnetic waves. Oh, okay. So have you covered colors and the eye? Yeah. Okay, brilliant. So you've finished this topic now and you've gone on to the next one. Yeah. And have you had your test. Yeah, how did you do with that? I think I did okay because like remembered everything. Brilliant. So what's your next topic? I'm plant nutrition, right? Okay, wonderful. All. Well, we're going to do colors today and then we're going to do lenses next lesson and then we will start plant nutrition as well. So that sounds okay. Yeah, brilliant. If we can get through this quickly, we can maybe go on to lenses today. We'll see how we get on. Right colors of light. So read this slide first, please. Learning objects objective to understand that White light is made up of different colors, which can be absorbed by reflective Drafall or transmitted through different materials. Success criteria to describe White light as being made up of three primary colors, which can form secondary colors when combined, to explain how collored filters work to predict the absorption and reflection effects of different colors of light on collored surfaces. All right, brilliant. Right. So we spoke about this briefly in a previous lesson. And you could remember the colors of the rainbow and you could remember the order. So we can skip by this. So the primary colors when we are talking about physics are red, Green and blue. So our eyes can detect red, Green and blue. So when we're talking about the spectrum and rainbows, that's talking about sunlight. So here we're just talking about artificial White light rather than natural sunlight, which is made up of the colors of the spectrum. So here we are talking about White light being made up of these three primary colors. So the different colors that we can see are a result of mixing these three colors. Display screens. So tvs and computers and phones are made of pixels of the primary colors. So all colors can be made by varying the brightness of different collored pixels. And if you've ever seen a tv screen that's gone wrong, you can sometimes see these pixels, these little squares. Secondary colors. So when we mix the primary colors, we can get the secondary colors. Red and Green gives us yellow. Blue and Green gives us cyan. And red and blue gives us some magenta. Now I've just got a little video clip showing these colors. Let me get the right video clipped for you. This is a key stage three light video right now. It can sometimes not be that clear seeing these colors. On our screen. So when she talks about White light being made in the middle, it's. Not very clear, but we can see it well enough. So this is just a demonstration showing making those secondary colors for your calendar. Yeah, okay. I just saw your hand going or thought there was a problem. I got a hair on my hand. I was trying to get it all. Okay, song, she got a mosquito trying to bite you or something. This is a key stage three light video looking at White light and how we can make White light. Can you hear that? Okay. Yeah. Using the spectrum of colors. Okay, so we've got the primary colors of light here, red, blue and Green. Not the same as the primary colors would be in art, okay? Red, blue and Green. And we can make different colors using different filters. Now when we talk about making colors using filters, we don't mean layering the filters up. We mean crossing over the lights that the filters have on them. Okay? So we can cross over two different lamps with two different filters. So let's move the Green away for a second. So we've got blue and red here. And when we mix them together, we get that nice magenta color. You can see it as they cross over there in the middle. Yeah. So like I said, it's not that clear. Slightly pink looking. That's meant to be the magenta. If we take the blue away for a moment and we use the red and the Green, we can make yellow. And you can yejust about see yellow if you use your imagination. I can certainly see some other colors as well. See that in the middle there. If we take the red away and we use the blue and the Green, we get cyan yecyan. So I think that blue filter, quite a pale blue filter, it looks cyan anyway, doesn't it? But there in the middle, it just gets a little bit lighter in the middle there. Okay, bring them all together. And we actually, if we get them all balanced exactly right, we can make in the middle there White light with a bit of luck. Let's just pull those around a bit to see if we can do it. I think that's probably as good as I can get. Don't can see. Yeah. So well, on the screen we can see cyan, we can see magenta and a little bit of magenta, and we can see White light. Okay, so we actually got the whole spectrum of colors there using the different ray boxes with their different filters. Okay, let's look at that as a summary then. So White light is made of the whole spectrum of colors. The primary colors of light are red, blue and Green. Magenta light can be made by shining a red light over a blue light, but not pushing those filters one in front at the other, using separate lights and crossing the lights over. Okay, so that's one example. Cyan can be made from mixing blue and Green lights together. And crossing the red and Green makes yellow when we cross right. I am going to do you know this off by heart? So do you know this picture off by heart or will it be useful for me to put that in the chat for you because you're going to need to you don't. Well I do. But like it's gonna to take me some time to remember that red and do is no gentle no, that's fine. So here in the chat, because you've got a worksheet to do in a minute, so you're going to use need though. So there it is. Can you see that in the chat box? Yeah Yeah okay. So I'll leave that there for you and you can use that in a minute when we come on the worksheet. So just back to this again. So red and Green yellow blue and Green cyan and red and blue magenta. Now obviously when you come to do your end of year exams, you are going to need to try and remember that in whatever ways easiest for you. Maybe if you're a visual learner, maybe trying to get this picture here imprinted in your brain might be the easiest way to remember it. It depends how you learn. So that's what we should have seen on the video when she crossed the lights. Like I said, it wasn't that clear. Certainly the White in the middle wasn't that clear. So primary colors around the outside, forming the secondary colors and then mixing together White light. Filters, did you do the experiment with the light box, the ray box and the filters? Was that yes, no, no, no. Okay, no problem. I'll show it to you later on. We'll look at that a little bit later on. So a filter is basically just a transparent sheet, like the old fashioned 3D glasses. Show you a picture of those. Yeah, so a filter here, you've got to be able to see through it. So it's just a colored piece of glass or plastic and we can use them in stage lighting, concerts, plays, etc. Now I know that you obviously haven't got these filters at home, so we're going to skip past this bit. So we can represent White light with the three primary colors. So what happens when White light hits a colored filter? Well, it will depend on what color the filter is, of course. So if we start off with a red filter and you shine White light through it, what happens? Only red passes through, but you can only see red. Yeah, absolutely. So the object you're looking at will look red because only red light is being passed through. So we need this word transmitted. That's the word that we use for PaaS through. And then absorbed is the word we use for when it's stopped or blocked. So that's quite straightforward. Gets a little bit harder to work out when we come to the secondary colors. So secondary colors. So what happens when magenta, one of the secondary colors, hits a red filter? Right? Well, let's get our picture on the screen now, and we can use this to help us understand. Right. So we've got a red filter and we are shining magenta light now. Magenta Yeah is made up of red and blue. So the red will PaaS through because it is a red filter. If it was a blue filter, the blue would PaaS through. What about if it was a Green filter? If it was the yushine magenta I black, okay, so nothing. Yeah so all of the light would be absorbed. Right. Let me give you the first worksheet then. Halla filtes. And there's the pen. So a top one here is an example of what I would like you to do. So for number one, White light shines on a blue filter. So White light is made up of red, blue and Green. So you need to add your three arrows, red, blue and Green. Now, because you're going to be repeating these, you can cut and paste them. So once you've drawn your first red arrow, you can copy it and use it for the other drawings later on. And then your description will use the words absorbed and transmit. Okay, Linda, have I got the first one? Wait, shall we do like a straighter arrow maybe? Stressing me out a little bit, quite wobbbly. Maybe we will draw something a bit nicer. Let me just double check whether we've actually got any. I don't think there's like an arrow, but like I think I can do this. I've got geometry. What have we got on here? Hmm. Okay, that's better. All brilliant. So just make that blue line. Can you Carry on that blue line so we can see that it's actually going all the way through it? That's better in your description. So using the word absorbed and transmitted. Don't worry about writing improproper sentences, just notes. So just red and Green light are absorbed, blue light transmitted, that's fine. Okay, perfect next one. So if you need to remind yourself the colors that make up magenta, you've got your little picture in the chat. When it's a straight line, you can't rub it out with the eraser. No, I'm not sure why. I'll just continue this. Right. Let me just put a copy of this on the charts. So I can remember what you've been doing. Okay, excellent one, nearly finished. That's enough. Don't worry, you don't need to put any more details. Who? Yeah, get that. So once you remember that color mixing diagram, this is pretty straightforward. Plus two. Do you use the American spelling of colour? Linda, did I ask you that before? No, it just autocorrected. Okay, that's fine. Yeah, it's not wrong anyway, so. So that's is just your computer. Is your school break up for Christmas? No, we have our break after this week. Okay, well that will be for Christmas. One tip. So how long do you get? Three weeks. Three weeks. Yeah because lots of the schools in China, they don't get a break at all now do they? Not until Chinese New year, but they have Christmas people. I think they have like Christmas holiday. No. So what would you prefer to have the Christmas holiday? Do you get less time for Chinese New year? Yeah. I think they put them together. Oh, so do you get any time off Christmas for Chinese New year? Five days? I don't know. Yeah. Okay. So I think, do the Chinese schools usually get about a month off or not that long for Chinese New year? I don't think is that wrong? Weeks. So they have their big break then Yeah, I feel a bit bad for them because it seems like a really long term. I think they're starting to get pretty tired. Yeah. Like once they have like two holidays at once. So like one holiday is seven days, the other holiis like eight days. Yeah. But when you put them together, you only get ten days off. Oh, it's not great. So I presume you get a bit longer now because you have got students who don't live in China and we'll go to other places. Is that right? Or do all your students tend to live in China? No. So theydo quite a bit of traveling. Yeah, like I think I'm going go like Australia or something. You are. Maybe. Oh, how exciting. Wow, have you been before? No. Nice. I was in Australia for Christmas once. Nice time a year to go, long, long time ago. But Yeah, Australia is an amazing place to visit. So how long is the flight there from China? I don't know. It's like like a lot of powers. You're still closer than me. Once I went to England, it took me twelve hours and I couldn't sleep. Oh no, that's awful. It's so hard to sleep on an aplane. Yeah were you in just normal economy class or were you in business or first class business? Oh, well, that's a bit better. That's that's no excuse. You should be able to sleep in business. Yeah once in my school, we have to go like like on like a six hour flight and ever in like midnight and we didn't get like business. We have to stay up and kind of class like the whole night. I always have to fly economy me unfortunately, as it's just too expensive. Otherwise, as much as I would love to go business or first class, but Yeah, economy is hard work. So I don't really like long flights anymore. Think the longest I've been is about six hours. That's that's enough for me. But when I went to Australia, I on the way there, I stopped in Hong Kong for a few nights just to break up the long flight. And on the way back, I stopped in Singapore, but it was still, I think, a 14 hour flight home from Singapore. And that's Yeah for better than 24 hours, which I think it takes directly from the uk to Australia. Can you imagine 24 hours on a plane in economy. No, but get to survive your holiday. Oh Yeah, that would just be torture. Well, I hope you get to go. That's really exciting to tell me all about it right next. So well done. Okay, things with that. So these are just a few more of the ones that you have just pracked. Now let's have a think about reflection. So how are we able to see things? Obviously, because light reflects off surfaces and travels into our eyes. But when you shine White light on surfaces, the surfaces don't all look White. They look various colors. Therefore, they must only reflect some of the light and absorb the rest, so this is very similar. Right? If a surface is black, it will absorb all colors of light. If a surface is White, it will reflect all colors. Happy with that. Yeah. Right, colored surfaces. So now we're thinking about reflection. So a red surface will only reflect red light. So it looks red. So the red light is reflected into our eyes, and that's why that looks red. So this is exactly the same principle as our filters. So I won't get you to do every single one of these examples. So magenta, of course, if we get our diagram up. So when we're talking about reflection, my Genta is made up of red and blue, so it will reflect back red and blue to our eyes. Hence it looks magenta. And blue will not be sorry, Green will not be reflected. It is absorbed. Now I'm just going to quickly note, let's do that worksheet first, and then I'll show you the ray box. I'll decide which ones of these I want you to do. I won't get you to do them all. So how many are there's ten. Or I might just let you do them quickly without worrying about straight lines. So don't worry about it being neat for this one. Right? So remembering this time, you're not drawing your rays going through, they are just being reflected. So don't worry about straight lines, just do it quickly. And don't worry about doing the typing either. So identineed to describe it, don't do the description. No, just do the diagram. Yep. So take note of these because when you get later on, it's not always White light. Yet red absorbed, blue absorbed, Green reflected, that's why it looks Green. Have you got any brothers and sisters, Linda? No, just you. Do you like it that way? Yeah. Right red and blue reflected Green absorbed, correct, okay, still in White light. Yep. Perfect. Now take note. We are no longer shining White light anymore. Now we're in colored light. So Green light on a blue surface set. Right? Talk me through this one. The surface is Green and yellow, light is made up of Green and red, so like red is absorbed and Green gets reflected. Good. Brilliant. And last one. Also on Linder. Alright, right, let me show you the second video now. So what you usually do for the practical is you have the light box. So the same one light box or ray box that you used for refraction, practical. And rather than putting in your little grate with the one slit, two slips and so on, you slot in a filter, and then you can look at the colors. So you hold different objects, and then you can see what colors they appear to be. This is a key stage three light video. Yep. So do you recognize that with the little slots. Yeah ray box. That's it. The ray box. Looking at colored filters, if I put the Green filter into the ray box, it transmits Green light. This means it lets Green light through. And if we remember, the White light is all colours of the spectrum. So it absorbs all colors except for the Green which it transmits. If I put the blue filter into the ray box, it transmits blue light. It allows blue light through the filter and absorbs all other colors of the spectrum. If I put the red filter into the ray box, it transmits red light and absorbs the other colors. If I have a cyan filter, cyan is made up of the blue light and Green light, so a cyan filter would allow Green light and blue light through the filter and absorb all other colors. If I had a yellow filter, yellow is made up of Green light and red light, so those two colors would be transmitted through a yellow filter. And finally, if I had a magenta filter, magenta light is made up of red and blue light. The red and blue light would be transmitted through a magenta filter. If I have a yellow filter, the yellow filter is made up of Green. What red light? That means that the yellow filter will allow Green and red light through it, transmitted through it, and all other colors will be absorbed. If I then have a red object, the red object, as we learned, that seemed like she, the video skipped and just repeated. Maybe it didn't. Maybe it's just me in colored objects will reflect the red light and absorb the Green. Okay, right. Sorry, let's just go back to that. And red light. That means that the yellow filter will allow Green and red light through it, transmitted through it, and all other colors will be absorbed. If I then have a red object, the red object, as we leart in colored objects, will reflect the red light and absorb the Green. Okay? If I have a cyan filter made up of Green and blue light, and my object is red, both of these colors, the Green and the blue, will be absorbed. So what colwould the object? Look, if it was red? By the red object, and therefore it will appear black. Let's have a look at the summary of colored filters. So if we have a red filter, a Green filter, or a blue filter, because they are the primary colors of light, they only transmit the colof, the filter, and absorb all of the colors. Here we can see we've got a cyan filter, and that allows the colors that make up cyan light to go through, which is Green and blue. There we have a yellow filter, which is made up of Green and red light. So Green and red lights are transmitted. All other colors are absorbed. Now this is where it gets tricky. So if my object is Green and I've got yellow light on it, the object will appear Green. Why? Because the Green light is reflected, the red light is absorbed. Just using the rules that we learned nt in the colored objects video, where it gets particularly challenging is if we have a blue object in a yellow light, a blue object will only reflect blue light. So the red and the Green light that makes up yellow will both be absorbed, so the object will appear black. Hope you found that useful. Thank you. Pray your next challenge. So a White surface will reflect all colours of light, so it will appear to be the color of whatever light is shining on it. And a black surface will absorb all colors, so it will always appear black. A surface that is a primary color will absorb all colors except for that color, so it will appear black if a different primary color shines on it. And finally, a surface that is a secondary colreflects, the primary colors that form it. So if a light of a primary colshines on it, it will either be that color or black. For example, a magenta surface will appear red under red light, blue under blue light, and black under Green light. Right? Predict the color. I think I've got this. Yeah, okay. Let me just find that for you. Color radiction. There we go. Right now I'm just double checking that you can draw on this. You should be able to draw a box, for example, if you thought this answer was gonna to be red, then if you click on it and bring up the little toolbar at the bottom, Linder, you can fill it. Yeah, know. Do you know how to do that? Do you know how to draw a circle? Yeah like that right? And then click on your circle with your select arrow. So on your, so on your toolbar, whatever your symbol for select, Oh, you've done it. Brilliant. So a White ball in red light will look red, correct? Yeah, again, only freehand will be erased with the rubber. Let's get your little symbol on this over go. I don't want to delete that again. Liagain. Wait, I can move it. A Red Bull in Green light, the Green is absorbed, so no colours are reflected, so it appears black. Oh, have you can you do control z on your keyboard control? Have we lost it then? I don't think it will work for me, because what happened? Do you think you accidentally deleted it? Yeah. I think it was when I click on the Green circle, okay, it's easy to do worry, right? How least do like that. I'll do, I'll do some. Yeah, Yeah, I'll do some for you. Don't worry. Oh, no. Amblue. Oh, my goodness. That's better. Back. Right. Okay. Think we're back to where we were. Yep. Do you know what else you can do? You can copy. If you've already done a black one, just duplicate it, click on it and duplicate it. Well, you can do that for the red. Duplicate your red one. Because you will need a red. That's it. Quicker. So all right, brilliancy, you've got a good understanding of filters and colors and reflections. Let's cut that out. Put on the chart. So I'm just going to double check when you break up. Sorry, I'm just looking at my. So possibly we may have some lessons cancelled if you do go to Australia, but at the moment I have got you on the so Oh, you'll still have them. Yeah. So I've got you on the 20 third and the thirtieth. So quite possibly. So how many science lessons have you got next week at school? This week is the last week and today was like the last last session. Okay. And where are you up to so far with photosynthesis? We have like gone a lot because we were a bit like back for the exright. Okay, so should Yeah, that's good. That should be done. I just don't want to get too far ahead. So that means that on the 20 third, so our next one note, I'm getting confused with what day we're on, right? So on the sixteenth we will do lenses, the I and some revision and then that gives us two lessons on plant nutrition. So we won't get too far ahead of what you're doing at school that that should be perfect. And when do you go back in January? Seventh I think okay. We might get three lessons then that's okay. That's fine. Not a problem. Alright. So our last thing to do today. Here's this one. So this is just a summary sheet. Three primary colors are. Like, can I just say it? Yeah. Red, Green and blue, secondary colors yellow, cyan, magenta, cyan. Cyan and magenta and. When while light passes through a color filter, the photo absorbs a color like some colors and transmits the others, right? So the light that we see will be the same color as the filter Yeah and then the different colors are absorbed. Explain why a White surface always appears the same color as the light being shone onto it. The light is reflected. Yet, because White surfaces reflect all wavelengths of light, so whatever color is being shown one unto it will be reflected back to our eyes. Why a blue surface under red light appears black. Because the blue surface absorbs the red light. So when you write the red lights shine at it. There's no color. Good. So the only color that a blue surface would reflect would be below. Everything else would be absorbed. All right, that's good. So next lesson we have got. And you said you didn't do this at all. Hang on, I'm just getting it. So did you do convex, concave and the human eye? Yeah. Oh, you did do it. Okay, brilliant. And did you do pinhole camera? We did I think we did. We did like an experiment on that. All right, that's fine. So I'll just show you a quick video clip of that to remind you. So we will do that next week with a little bit of revision as well because I think we'll get all of that covered. And then we will go on to plant nutrition all not sure what I'm giving you for homa yet. Probably another exam question. So I'll put that onto the chat and I get that sorted for you. Okay, Linda, I will see you next week. Bye. Thank you. Bye.