Optics Question 749

Question: The time required to pass the light through a glass slab of 2 mm thick is ( $ {\mu _{glass}}=1.5 $ )

[AFMC 1997; MH CET 2002, 04]

Options:

A) $ {{10}^{-5}}s $

B) $ {{10}^{-11}} $ $ s $

C) $ {{10}^{-9}} s $

D) $ {{10}^{-13}} $ $ s $

Show Answer

Answer:

Correct Answer: B

Solution:

$ t=\frac{\mu x}{c}=\frac{1.5\times 2\times {{10}^{-3}}}{3\times 10^{8}}={{10}^{-11}} $ sec



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