a) The ploarizing axis of a polarizing sheet makes an angle of 30 degree to the

Question

a) The ploarizing axis of a polarizing sheet makes an angle of 30 degree to the electric field of a linearly polarized light. The polarized light has an intensity Io. The intensity of the light after it goes through the polarizing sheet is?

b) The polarizing axis of a polarizing sheet makes an angle of 30 degree from the vertical. An unpolarized light of intensity Io passes through the polarizing sheet. The intensity of the light after it goes through the polarizing sheet is?

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Explanation / Answer

Given    intensity of polarised light is Io a)    intensity of polarised light after passing  through polarising sheet is            I = I o cos               = Io cos 30                = 0.866 Io   b) intensity of unpolarised light after passing through polarised sheet is           I = ( Io / 2 ) cos 30               = ( Io /2 ) 0.866                = 0.4332 Io   

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