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 I_(A) and I_(B) respectively, then (I_(A))/(I_(B)) equals :

Two beams, A and B, of plane polarized light with mutually perpendicul

1.	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 I_(A) and I_(B) respectively, then (I_(A))/(I_(B)) equals :
Answer» `1/3` 3 `3/2` 1 Solution : `I_(A) COS^(2) 30^(@) = I_(B) cos^(2)60^(@)` `I_(A) 3/4 = I_(B) (1)/(4)``(I_(A))/(I_(B)) = 1/3`

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