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Q.

A polarizer-analyser set is adjusted such that the intensity of light coming out of the  analyser is just 10% of the original intensity. Assuming that the polarizer -analyser set does not absorb any light, the angle by which of the analyser need to be rotated further to reduce the output intensity to be zero is

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a

45º

b

71.6º

c

90º

d

18.4º

answer is D.

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Detailed Solution

Let say incoming intensity to Analyser = I0​and outgoing intensity to Analyser = I​Then as per Malus' Law, I=I0cos2θ            ​⇒I010=I0cos2θ ⇒cosθ=110=0.31⇒θ = 71.6oSo, angle rotated should be = 90º-71.6º=18.4º
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