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Light (Colour (White light is a mixture of seven colours, Splitting colour…
Light
Colour
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White is made up of the colours - Red, Orange, Yellow, Green, Blue, Indigo, Violet
A good way to remember what colours in the rainbow are, and what order they come in is ' Richard Of York Gave Battle In Vain
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If you look at a coloured object in a coloured light, the objects colour may look different
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Light
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Travels through transparent objects, but not opaque objects
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When light travels through translucent objects, the light scatters
Reflection
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The angle of incidence is equal to the angle of reflection, in specular reflection - this is know as the law of reflection
Angles are measured between the light rays and the normal - a line drawn at right angles to the reflecting surface
The reflected rays of light appear to come from a point behind the mirror - this is why we can see images in a mirror
In a plane mirror the image is the same size as the object and the same distance away from he mirror
In mirror, left becomes right and right becomes left
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Lenses
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Lenses are used in cameras, microscopes and telescopes
Refraction
When light is transmitted through glass, it slows down and changes its direction and heads for the normal
When light travels back through the transparent object, it speed us and heads away from the normal
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Eyes
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Cone cells detect the primary colours - red, green, blue