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A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is 

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a
45°
b
39°
c
20°
d
30°

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detailed solution

Correct option is D

Given  i=e=34A=34×60=45oIn  the  position  of  minimum  deviation2i=A+δm   or  δm=2i−A=90−60=30o


Similar Questions

ABC is an isosceles right angled triangle with the angle BAC 90o. A ray of light parallel to the base BC strikes the face AB.  The refracted ray in the prism strikes the base BC. If the refractive index of the material of the prism is 2, find the total angle of deviation of the final emergent ray


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