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Question
The diagram shows the path of a ray of light through a rectangular glass block placed in a liquid of uniform density.
(a) Does the light speed up or slow down in the glass,
(b) Give the reason for your answer.
Solution
(a) The speed of light, travelling from liquid to glass, slow down.
(b) Speed in liquids =
Speed of light in glass =
Since the refractive index in glass is usually higher than that of liquid, hence the speed of light in glass will be less.
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