Question

What is true about the refractive index of a medium?
A. It increases with an increase in angle of incidence
B. It decreases with a decrease in angle of refraction
C. It decreases with an increase in angle of incidence.
D. It is independent of any change in angle of incidence or angle of refraction
E.It increases with a decrease in angle of refraction.

Answer 1

D. It is independent of any change in angle of incidence or angle of refraction
\[\eta=\frac{ c }{ \nu } \]
where n=refractive index
c=speed of light in vacuum
v=velocity of light in that medium