Q. What should be refractive index of a transparent medium to be invisible in vacuum?
A) 1
B) <1
C) >1
D) None of these
Explanation
(a) To be invisible in vacuum $\mu$ of medium must be equal to $\mu$ of vacuum, which is 1.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.