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Q.

Is it true that the refractive index of a medium is defined as the ratio of the speed of light in vacuum to the speed of light in the medium?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
“The refractive index of a medium is defined as the ratio of speed of light in vacuum to the speed of light in the medium.” This is also known as the absolute refractive index. The speed of light in a medium is always less than the speed of light in a vacuum, so the refractive index is always greater than one. For rarer mediums, the speed of light is more, and for denser mediums, the speed of light is comparatively less.
 
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