Optics Question 893

Question: Two polaroids have their polarizing directions parallel so that the intensity of a transmitted light is maximum. The angle through which either polaroid must be turned if the intensity is to drop by one-half is

Options:

A) $ 135{}^\circ $

B) $ 90{}^\circ $

C) $ 120{}^\circ $

D) $ 180{}^\circ $

Show Answer

Answer:

Correct Answer: A

Solution:

[a] For $ I=\frac{I _{0}}{2} $ and $ I=I _{0}{{\cos }^{2}}\theta =\frac{I _{0}}{2} $

$ \therefore \theta =45^{o} $

Therefore the angle through which either polaroids turned is $ 135{}^\circ (=180{}^\circ -45{}^\circ ) $



NCERT Chapter Video Solution

Dual Pane