Making colored light PRIMARY COLORS cgrahamphysics.com 2016 3/16/2016
Which circles are the same colour on each side? cgrahamphysics.com 2016 3/16/2016
What are primary colors? cgrahamphysics.com 2016 3/16/2016
Not in Physics we are talking about light! cgrahamphysics.com 2016 3/16/2016
Red Orange Yellow Green Blue Violet Mixing all these colors together we get what color? 3/16/2016 cgrahamphysics.com 2016
Primary colors in Physics are Blue Red Green cgrahamphysics.com 2016 3/16/2016
Are you smart? Say the color, not the word pink red blue white black green orange yellow cgrahamphysics.com 2016 3/16/2016
Why are there primary colours? The Wonderful World Of Colour - YouTube [360p].mp4 cgrahamphysics.com 2016 3/16/2016
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 2016 3/16/2016
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 2016 3/16/2016
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 2016 3/16/2016
Would this have been easier? cgrahamphysics.com 2016 3/16/2016
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 2016 3/16/2016
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Mixing coloured light cgrahamphysics.com 2016 3/16/2016
yellow magenta cyan cgrahamphysics.com 2016 3/16/2016
What s so special about red, green and blue? cgrahamphysics.com 2016 3/16/2016
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On the back of the retina are rods and cones cgrahamphysics.com 2016 3/16/2016
Cones: Responsible for color vision Pigments of cones are of three types: cgrahamphysics.com 2016 3/16/2016 blue, green and red
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 2016 3/16/2016
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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
Now try and work our what colours you would need to create an after image of... 1. 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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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 2016 3/16/2016
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 2016 3/16/2016