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 \(\frac{I_A}{I_B}\) equals
1
1
2
\(\frac{1}{3}\)
3
3
4
\(\frac{3}{2}\)
5
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