Question

The unit of refractive index is
Select one:
a. cm
b. mm
c. deg
d. no unit​

Answer 1

Answer:

(D) Unit less.

Refractive index is a ratio of indices or ratio of speed of light is different mediums. So the units gets cancelled over all.

Answer 2

Answer:

d.) no unit

Correct answer is (d)

Refractive index of amedium is the ratio of the speed of light in vacuum to the speed light in the medium. Therefore, it has no units.

Hope it helps ✔︎✔️.