Optics Question 83

Question: A ray of light falls on the surface of a spherical glass paper weight making an angle $ \alpha $ with the normal and is refracted in the medium at an angle $ \beta $ . The angle of deviation of the emergent ray from the direction of the incident ray

[NCERT 1982]

Options:

A) $ (\alpha -\beta ) $

B) $ 2(\alpha -\beta ) $

C) $ (\alpha -\beta )/2 $

D) $ (\beta -\alpha ) $

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Answer:

Correct Answer: B

Solution:

From the following ray diagram it is clear that $ \delta =(\alpha -\beta )+(\alpha -\beta ) $

$ =2(\alpha -\beta ) $



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