Question

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Answer 1

The two factors on which the refractive index of a medium depends are:

Nature of a medium i.e. its optical density (e.g. μg = 1.5, μw = 1.33) – Smaller the speed of light in a medium relative to air, higher is the refractive index of that medium.

Physical condition such as temperature – with increase in temperature, the speed of light in medium increases, so the refractive index of medium decreases.