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Two beams A and B, of plane polarized li...

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)`

Text Solution

Verified by Experts

The correct Answer is:
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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