Tow beams, A and B, of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30º makes the two beams appear equally bright. If the initial intensities of the two beams are I A and I B respectively, then 
equals
A
3
B
C
1
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Sol.
I A cos 2 30° = I B cos 2 60° ⇒ Ι A 
= Ι B . 
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