Two beams, A and B ,


Two beams, $\mathrm{A}$ and $\mathrm{B}$, of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam $\mathrm{A}$ has maximum intensity (and beam $\mathrm{B}$ has zero intensity), a rotation of polaroid through $30^{\circ}$ makes the two beams appear equally bright. If the initial intensitites of the two beams are $\mathrm{I}_{\mathrm{A}}$ and $\mathrm{I}_{\mathrm{B}}$ respectively, then $\frac{\mathrm{I}_{\mathrm{A}}}{\mathrm{I}_{\mathrm{B}}}$ equals :

  1. 1

  2. $\frac{1}{3}$

  3. 3

  4. $\frac{3}{2}$

Correct Option: , 2


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