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Question

A ray of light is incident on a glass plate. The light ray travels distance of 5 cm inside the glass plate before emerging out of the glass plate. If the incident ray suffers a deviation of 300. the perpendicular distance between incident and the emergent ray is

A
5 cm
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B
2.5 cm
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C
7.5 cm
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D
10 cm
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Solution

The correct option is B 2.5 cm
t thickness of glass plate
d lateral displacement
d=(tcosr)sin(ir)

d=5cos(θ30)cos(θ30)sin[θ(θ30)]

=5sin30

=52 =2.5
Hence,
option (B) is correct answer.

1205428_1269687_ans_aed9767cf1864f1f9c6759b0fd3b5cd6.PNG

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