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Tuesday 22nd March Colour
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Colour White light is not a single colour; it is made up of a mixture of the seven colours of the rainbow. We can demonstrate this by splitting white light with a prism: This is how rainbows are formed: sunlight is “split up” by raindrops.
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Red Magenta Yellow White Blue Green Cyan
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Adding colours White light can be split up to make separate colours. These colours can be added together again. The primary colours of light are red, blue and green: Adding blue and green makes cyan (light blue) Adding blue and red makes magenta (purple) Adding red and green makes yellow Adding all three makes white again
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Task 1: Questions What are the 7 colours of white light?
What are the 3 primary colours? Describe how cyan, magenta and yellow are formed?
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Only red light is reflected
Seeing colour The colour an object appears depends on the colours of light it reflects. For example, a red book only reflects red light: Homework White light Only red light is reflected
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A white hat would reflect all seven colours:
A pair of purple trousers would reflect purple light (and red and blue, as purple is made up of red and blue): Purple light A white hat would reflect all seven colours: White light
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Task 2:Design an outfit Colour the outfit – different colours for the top, trousers shoes etc. Know describe how we see each of these colours
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Task 3: Bill Nye colour
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Using coloured light If we look at a coloured object in coloured light we see something different. For example, consider a football kit: Shirt looks red White light Shorts look blue
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In different colours of light this kit would look different:
Red light Shirt looks red Shorts look black Shirt looks black Blue light Shorts look blue
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Homework Task 4: Complete Object Colour of light
Colour object seems to be Red socks Red Blue Black Green Blue teddy Green camel Magenta book Homework
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Homework Object Colour of light Colour object seems to be Red socks
Blue Black Green Blue teddy Green camel black green Magenta book Homework
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Make a note of this info Draw a diagram or picture Discuss Think Investigate Watch Answer question
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Using filters Filters can be used to “block” out different colours of light: Red Filter Magenta Filter
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Investigating filters
Colour of filter Colours that could be “seen” Red Green Blue Cyan Magenta Yellow
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Red Blue Green White Yellow Cyan Magenta
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