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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 has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30 makes the two beams appear equally bright. If the initial intensities of the two beams are IA and IB respectively, then IAIB equals :

(A)1(B)13(C)3(D)32

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