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 [JEE ONLINE 07-05-2012]
A)135°
B)90°
C)120°
D)180°
Correct Answer:
A
Solution :
[a] For and
Therefore the angle through which either polaroids turned is