Making colored light PRIMARY COLORS

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1 Making colored light PRIMARY COLORS cgrahamphysics.com /16/2016

2 Which circles are the same colour on each side? cgrahamphysics.com /16/2016

3 What are primary colors? cgrahamphysics.com /16/2016

4 Not in Physics we are talking about light! cgrahamphysics.com /16/2016

5 Red Orange Yellow Green Blue Violet Mixing all these colors together we get what color? 3/16/2016 cgrahamphysics.com 2016

6 Primary colors in Physics are Blue Red Green cgrahamphysics.com /16/2016

7 Are you smart? Say the color, not the word pink red blue white black green orange yellow cgrahamphysics.com /16/2016

8 Why are there primary colours? The Wonderful World Of Colour - YouTube [360p].mp4 cgrahamphysics.com /16/2016

9 Aim To explain why some objects have colors Recall the primary colours Recall the outcome of mixing colors Key words Absorption Filter Transmit Primary colors - Secondary colors - cgrahamphysics.com /16/2016

10 You are about to see an artists impression of a famous moment in science You will have 20 seconds to look at the picture. Try and observe and memorize as many details as you can. End cgrahamphysics.com /16/2016

11 In the picture 1. Is the scientist wearing a jacket or just a waist coat? Jacket and Waist coat 2. Does the scientist have short hair or long hair? Long hair 3. The scientist was holding something. What was he holding and in what hand? Prism in right hand 4. Which famous scientist is this and what was he doing? Newton discovered the dispersion Of light cgrahamphysics.com /16/2016

12 Would this have been easier? cgrahamphysics.com /16/2016

13 How would our world change? Discuss what would happen to the way we live if we couldn't see in color What things would be affected? Would it a positive change? cgrahamphysics.com /16/2016

14 cgrahamphysics.com /16/2016

15 Mixing coloured light cgrahamphysics.com /16/2016

16 yellow magenta cyan cgrahamphysics.com /16/2016

17 What s so special about red, green and blue? cgrahamphysics.com /16/2016

18 cgrahamphysics.com /16/2016

19 On the back of the retina are rods and cones cgrahamphysics.com /16/2016

20 Cones: Responsible for color vision Pigments of cones are of three types: cgrahamphysics.com /16/2016 blue, green and red

21 After image To see an after-image, one need only look intently at any object for a short time, then direct the eyes at a blank surface like a wall. Every color has an opposite, and although individual's perceptions do vary, the range of after images seen is consistent. Look at the center dot for 20 seconds cgrahamphysics.com /16/2016

22 End cgrahamphysics.com /16/2016

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24 How does it work? Cyan is made up of green and blue light. When you stare at the center part of the image the blue and green light sensitive cells become desensitized. After this, when you look at the white screen the all the colours fall on your retina; however, only the red cells are stimulated because the green and blue cells are still inactive. Your brain only sees red where the cyan was. Now explain why yellow forms a blue after Image Yellow rods are desensitized, which means green and red rod are not stimulated as yellow is a 3/16/2016 mix of red and green. Only blue rods cgrahamphysics.com are stimulated 2016

25 Now try and work our what colours you would need to create an after image of American flag 4. The yellow sun 2. Korean flag 5. Green leaf 3. A pink heart 6. Blue-green ocean, blue sky and yellow sand 3/16/2016 cgrahamphysics.com 2016

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44 Quick questions What are the 3 primary colors? (3 marks) What are the three secondary colors? What two primary colors is each made from? (6 marks) If you wanted to make a green after image what color would you use in the real image? (1 mark) cgrahamphysics.com /16/2016

45 Discuss Are there any undiscovered colors? Do we all see red the same way? Can we ever know? Could the concept of red be fully explained to a person born blind? cgrahamphysics.com /16/2016

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