Question

A prism of refractive index has refracting angle . In order that a ray suffers minimum deviation it should be incident at an angle:

A

B

C

D

none

Medium
Solution
verified
Verified by Toppr
Correct option is A)

Given: A prism of refractive index has refracting angle
To find the angle of incidence in order that a ray suffers minimum deviation 
Solution:
As per the given criteria,
refractive index of the prism,
Angle of the prism,
For minimum angle of deviation we have angle of incidence is equal to angle of emergence, i.e.,
Hence, , where is the minimum deviation angle.
We know,
Multiply and divide by , we get
In order that a ray suffers minimum deviation it should be incident at an angle

Solve any question of Ray Optics and Optical Instrument with:-
Was this answer helpful?
upvote 0
downvote0