A ray of light travelling through rarer medium is incident at very small angle 
on a glass slab and after refraction its velocity is reduced by 
. The angle of deviation is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
: Let velocity of light in rarer medium be 
.
Then velocity of light in glass is 
.
Refractive index of glass with respect to given rarer medium is 
From Snell's law, 
( 
for small angles, 
)
or 
Angle of deviation 
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