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Question

A thin prism of angle 5o is placed at a distance of 10 cm from object. What is the distance of the image from object? (Given μ of prism = 1.5)

A
π8cm
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B
π12cm
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C
5π36cm
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D
π7cm
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Solution

The correct option is C 5π36cm
Deviation angle of light caused by a prism of prism angle A=A(μ1)=(5×π180)×0.5 radians=5π360radians

Hence the total deviation after travelling back a distance of 10 cm =5π360×10cm=5π36cm

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