Optics Question 573
Question: When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms?1)
[Kerala PMT 2005]
Options:
A) $ 3\times 10^{8} $
B) $ ( \frac{3}{\sqrt{2}} )\times 10^{8} $
C) $ \sqrt{3}\times 10^{8} $
D) $ 0.5\times 10^{8} $
Show Answer
Answer:
Correct Answer: C
Solution:
From Brewster’s law $ \mu =\tan i _{p} $
Therefore $ \frac{c}{v}=\tan 60{}^\circ =\sqrt{3} $
Therefore $ v=\frac{c}{\sqrt{3}}=\frac{3\times 10^{8}}{\sqrt{3}}=\sqrt{3}\times 10^{8} $ m/sec.
