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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 ntensity), 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 `(I_A)/(I_B)` equals:
A. `2`
B. `(3)/(2)`
C. `1`
D. `(1)/(3)`

1 Answer

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Best answer
Correct Answer - D
`l_(A) cos^(2)30^(@)=l_(B) cos^(2)60^(@)`
`rArr I_(A)(3)/(4)=I_(B).(1)/(4)`
`(I_(A))/(I_(B))=(1)/(3)`

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