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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 60° makes the two beams appear equally bright. If the initial intensities of the two beams are lA and lB respectively, then equals
  • a)
    1/4
  • b)
    2/3
  • c)
    3/2
  • d)
    1/2
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Two beams A and B of plane polarized light with mutually perpendicular...
By the law of malus I = I0 cos2- θ
IA '=IA cos2 60º
IA '= IB '
IA 'cos 2 60º= IB 'cos30º 
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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 60° makes the two beams appear equally bright. If the initial intensitiesof the two beams are lA and lB respectively, thenequalsa)1/4b)2/3c)3/2d)1/2Correct answer is option 'C'. Can you explain this answer?
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