JEE Main | 2014Wave OpticsHard

Question

Two 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 IA and IB respectively, then equals

Options

A.3
B.
C.1
D.

Solution

By law of Malus, I = I0cos2θ
Now, IA′ = IA cos230
As IA′ = IB′
⇒     IA × = IB ×
       

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