In which medium the value of the speed of light will be highest?

Medium
Refractive Index
Water
1.33
Crown glass
1.52
Rock salt
1.54
Ruby
1.71

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Water

Crown glass

Rock Salt

Ruby

answer is A.

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Detailed Solution

The value of the speed of light will be highest in water.
The formula of refractive index is given as
Refractive index =

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

The speed of light in the vacuum is the same for all mediums. So, for the highest value of the speed of light, the value of the refractive index will be minimum. And we can see that water has the minimum value of refractive among all the given mediums. Hence in water, the value of the speed of light is the highest.

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