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Two beams, A and B of plane polarised light with mutually perpendicular plane of polarisation 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))=..... |
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Answer» `(3)/(2)` `:.I_(A)cos^(2)30^(@)=I_(B)cos^(2)60^(@)` `:.(I_(A))/(I_(B))=(cos^(2)60^(@))/(cos^(2)30^(@))=(((1)/(2))^(2))/(((SQRT(3))/(2))^(2))` `:. (I_(A))/(I_(B))=(1)/(3)` |
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