Optics Question 738
Question: The time taken by sunlight to cross a 5 mm thick glass plate $ (\mu =3/2 $ ) is
[MP PMT/PET 1998; BHU 2005]
Options:
A) 0.25 $ \times $ 10?10 $ s $
B) $ 0.167\times {{10}^{-7}} $
$ s $
C) $ 2.5\times {{10}^{-10}} $
$ s $
D) $ 1.0\times {{10}^{-10}} $
$ s $
Show Answer
Answer:
Correct Answer: A
Solution:
$ t=\frac{\mu x}{c}=\frac{\frac{3}{2}\times 5\times {{10}^{-3}}}{3\times 10^{8}}=0.25\times {{10}^{-10}}s $
