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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 and 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 B A I I equals -

1. 2 3
2. 1
3. 3 1
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Correct answer: 3 1

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