Q. A given ray of light suffers minimum deviation in an equilateral prism $P.$Additional prisms$\ Q$ and of identical shape and material are now added to $P,$as shown in the figure. The ray will suffer
A) Same deviation
B) Greater deviation
C) Total internal reflection
D) No deviation
Explanation
(a) Since prism $P$ is placed in position of minimum deviation, therefore refracted rays becomes parallel to the base of the prism, again by adding two prism $R$ and $Q$ of same material as shown in figure, the deviation produced by $Q$ and $R$ equal and opposite in sense, therefore final deviation is same as due to prism $P$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.