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 ) $
Show Answer
Answer:
Correct Answer: B
Solution:
From the following ray diagram it is clear that $ \delta =(\alpha -\beta )+(\alpha -\beta ) $
$ =2(\alpha -\beta ) $
