Optics 6 Question 15

17. A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45 relative to that of A. The intensity of the emergent light is

(a) I0

(b) I0/2

(c) I0/4

(d) I0/8

(2013 Main)

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Solution:

  1. Relation between intensities is

IR=I02cos2(45)=I02×12=I04



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