Question

Define refractive index of a transparent medium . What is its unit ? Which has higher refractive index, glass or water.

Answer 1

refractive index of a transparent medium is the ratio of speed of light in vaccum to speed of light in that medium.

the refractive index has no unit as it is the ratio of two similiar quantities.

glass has more refractive index

Answer 2

Refractive index of a transparent medium is defined the ratio of speed of light in vacuum and speed of light in medium.

Is given by : n = c/v

Where,
n is the refractive index.
c is the speed of light in vacuum.
v is the speed of light in medium.
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It has no units.
Because it is the ratio of quantities which are similar.

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Glass has higher refractive index.

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:)