Hint: Here, we have to apply the concept of angle of deviation
Solution:
Step1: Draw free body diagram
Step2: Apply given conditions
According to free body diagram,
i=Angle of incident, A=Small angle of
prism & µ=Refractive index of material
Assume, e= angle of emergence
given that, the incident ray emerges normally from the opposite surface,
Hence,
Step3: Find angle of deviation
We know the angle of deviation () can be,
In case of prism, we know that, sum of small
angle of prism & angle of deviation in a prism is equal to the sum of angle
of incidence and angle of emergence. So, we get,
Submit values from equation (1) & (2) in
equation (3) we get,
or
Hence, option (D) is correct.