Optics Question 752

Question: What is the time taken (in seconds) to cross a glass of thickness 4 mm and $ \mu $ = 3 by light

[BHU 1998; Pb. PMT 1999, 2001; MH CET 2000; MP PET 2001]

Options:

A) $ 4\times {{10}^{-11}} $

B) $ 2\times {{10}^{-11}} $

C) $ 16\times {{10}^{-11}} $

D) $ 8\times {{10}^{-10}} $

Show Answer

Answer:

Correct Answer: A

Solution:

$ t=\frac{\mu x}{c}=\frac{3\times 4\times {{10}^{-3}}}{3\times 10^{8}}=4\times {{10}^{-11}} $ sec



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