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Question

A plane polarized light is incident on a polariser with its pass axis making angle θ with x-axis, as shown in the figure. At four different values of θ,θ=8o,38o,188o and 218o, the observed intensities are same. What is the angle between the direction of polarization and x-axis
870265_cc123c4bc3ba4a2eb56d91753edb382b.png

A
203o
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B
45o
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C
98o
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D
128o
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Solution

The correct option is A 203o
Let the angle between polarization direction and x-axis be θ.
So angle between polarisation direction and pass axis of polariser is (θθ)
Given θ=8o,88o,188o,218o
I=Iocos2(θθ)
For θ=203o intensities are same

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