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The refractive index of a transparent medium is greater than $1$ because which of the following reasons?

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speed of light in vacuum < speed of light in transparent medium

speed of light in vacuum > speed of light in transparent medium

speed of light in vacuum = speed of light in transparent medium

frequency of light wave changes when it moves from rarer to denser medium

answer is B.

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Detailed Solution

The refractive index of a transparent medium is greater than

1

because

speed of light in vacuum > speed of light in transparent medium

.
As we know, the refractive index (µ) is the ratio between the speed of light in a vacuum and the speed of light in a medium.

µ = \frac{speed of light in vacuum}{speed of light in medium}

And the speed of light in a vacuum is always greater than the speed of light in any medium. Therefore the value of µ (refractive index) is always greater than 1.

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