Refractive index of diamond is 2.42. What do we mean from this?

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Speed of light in diamond is raised by a factor 2.42 relative to that in vacuum

Speed of light in diamond is lower by a factor 2.42 relative to that in vacuum

Speed of light in air equals to speed of light in diamond

None of the above

answer is B.

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Detailed Solution

Given, refractive index of diamond

μ_{d} = 2.42

We know, the refractive index of a medium is the ratio of speed of light in vacuum to the speed of light in that medium.

μ = \frac{v}{c}

= \frac{Speed of light in medium}{Speed of light in vacuum}

\Rightarrow v_{d} = \frac{c}{μ_{d}}

\Rightarrow \frac{c}{2.42}

⇒ Speed of light in diamond is lower by a factor 2.42 relative to that in vacuum.

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