A ray of light enters into benzene from air

Asked by admin @ 17/08/2021 in Physics viewed by 293 People

A ray of light enters into benzene from air. If the refractive index of benzene is 1.50, by what percent does the speed of light reduce on entering the benzene?

Answered by admin @ 17/08/2021

Answer:

33.3 % .

Explanation:

Given :

Refractive index of benzene = 1.50

We know :

Speed of light = 3 × 10⁸ m / sec

We know formula for n :

n = speed of light in vacuum / speed of light in benzene

n = c / v

1.5 = 3 × 10⁸ / v

v = 2 × 10⁸ m / sec

Now ,

Percentage ( % ) decrease = 1 × 10⁸ / 3 × 10⁸ × 100 %

% decrease = 33.3 % .

Therefore , we get required answer.

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