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Question

# A plane polarized light is incident on a polarizer with its pass axis making angle θ with the x-axis, as shown in the figure. At four different values of θ,θ=8∘,38∘,188∘ and 218∘ the observed internists are same. What is the angular between the direction of polarization and the x-axis?

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

## The correct option is C 203oThe final intensity of polarized light=I02cos2θfosθ=8∘Intensity =I02cos2(8−α)θ=38∘I2=I02cos2(38−α)θ=188∘I3=I02cos2(188−α)θ=218∘I4=I02cos2(218−α)Given I1=I2=I3=I4this happens when α=203∘I1=I2=I3=I4=I02cos2(15)α=203∘option C is Correct.

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