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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 $30^{\circ}$ makes the two beams appear equally bright. If the initial intensities of the two beams are $I_A$ and $I_B$ respectively, then $\large\frac{I_A}{I_B}$ equals :

$\begin{array}{1 1}(A)\;1 \\ (B)\;\frac{1}{3} \\(C)\;3 \\(D)\;\frac{3}{2}\end{array} $

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$\large\frac{I_A}{I_B}$ equals to $\large\frac{1}{3}$
Hence B is the correct answer.
answered Apr 7, 2014 by meena.p

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