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Unpolarised light of intensity I0 gets polarized emerges from a polarizer. It then passes through an analyzer. The intensity of light emerging from the analyzer is I0/8 . The angle between the polarizing direction of the polarizer and analyzer is ……………. degree

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Since, average of  cos2 θ is 1/2 so if  I0 is intensity of unpolarised light then intensity of polarized coming out from the polarizer is 1/2

Thus,   I1 = 1/2 I0  ...(i)

By Malaus law, the intensity of light coming out from the analyzer

  I2 =  Ip cos2  θ . ...(ii)

By equation (i) & (ii), we get

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