Q.

What is the absolute refractive index?


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a

Ratio of speed of light in rarer medium to that of denser medium

b

Ratio of speed of light in air to speed of light in medium

c

Ratio of speed of light in air to speed of light in vacuum

d

Ratio of speed of light in a vacuum to speed of light in medium 

answer is D.

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Detailed Solution

The absolute refractive index is the ratio of speed of light in a vacuum to speed of light in the medium.
The absolute refractive index is defined as the ratio of light's speed in a vacuum to the light's speed in the given medium. It is never less than 1.
If c and are the speeds of light in a vacuum and in the given medium, then the absolute refractive index is given as n=cv
 
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