Whaita is the velocity of light in a diamond if the refractive index of diamond with respect to vacuum is $2.5$ ?

5 \times 10^{8}

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1.2 \times 10^{10}

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2.5 \times 10^{8}

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1.2 \times 10^{8}

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Solution

The correct option is D $1.2 \times 10^{8}$
Refractive index of a diamond $=$ Velocity of lihgt in vacuum/Velocity of light in the diamond
$2.5 = 3 \times 10 / Velocity of light in the diamon$
Velocity of light in the diamond $= 3 \times 10 / 2.5 = 1.2 \times 10^{8} m / s$

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