Q. Which of the prism is used to see infra-red spectrum of light
A) Rock-salt
B) Nicol
C) Flint
D) Crown
Explanation
(a) Ordinary glass prism (crown, flint) absorbs the infrared radiation but rock salt prism transmit them. Hence it is used to obtain the spectrum of infrared radiation
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.