A prism of refractive index 
has a refracting angle of 60°. At what angle a ray must be incident on it so that it suffers a minimum deviation ?
Text Solution
Verified by ExpertsThe correct answer is:
A
I n relation for refractive index of prism is
μ = 
…
The condition for minimum deviation is
r = 
= 
= 30°
putting the given values of μ = 
and r = 30° in Eq. (i), we get
= 
or sin i 
× 
= 
sin i = sin 45°
∴ i = 45°
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