Two beams , A and B, of plane polarised light with through a polaroid, from the position when the beam A has maximum intensity ( and beam B has zero intensity) a rotation of polaroid through 60anddeg;makes the two beams appear equally bright. If the initial intensitiesof the two beams are lA and lB respectively, then lA / lB equals________.Correct answer is '3'. Can you explain this answer?

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Two beams , A and B, of plane polarised light with 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 l_A and l_B respectively, then l_A / l_B equals________.

Correct answer is '3'. Can you explain this answer?

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Two beams , A and B, of plane polarised light with through a polaroid,...

3
By law of malus I = I₀ cos² θ

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Two beams , A and B, of plane polarised light with 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, then lA / lB equals________.Correct answer is '3'. Can you explain this answer?

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