1.

a) State and explain the laws of refraction of light with the help of a labelled diagram. b) What is meant by the refractive index of a substance? c) Light travels through air at 300 million `ms^(-1)`. On entering water it slows down to 225 million `ms^(-1)`. Calculate the refractive index of water.

Answer» `1.24 xx 10^(8)ms^(-1)`


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