State the speed of light in:
(a) air
(b) glass
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(a) The speed of light in air is 3 x 108 m s-1.
(b) The speed of light in glass is 2 x 108 m s-1.
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Can light travel in vacuum?
State two uses of a plane mirror.
What are primary colours? Name the three primary colours.
State whether light slows down or speeds up in the following cases:
(a) Light going from air to glass.
(b) Light going from glass to water.
(c) Light going from water to air.