Optics 6 Question 10

12. Unpolarised light of intensity I passes through an ideal polariser A. Another identical polariser B is placed behind

A. The intensity of light beyond B is found to be I2. Now, another identical polariser C is placed between A and B. The intensity beyond B is now found to be 18. The angle between polariser A and C is

(2018 Main)

(a) 60

(b) 0

(c) 30

(d) 45

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Solution:

Using the relation, I=I0cos2θ

We have,

or

I2(cos2θ)2=I8cos2θ=12cosθ=12θ=45



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