Question

- Optical path is equal to
(A) refractive index x path-length
(B) refractive index/path-length
(C) path-length/refractive index
path - length
(D) refractive index x path length/2
​

Answer 1

Answer:

(A) refractive index x path-length

Explanation:

In optics, optical path length (OPL) or optical distance is the product of the geometric length of the path followed by light through a given system, and the refractive index of the medium through which it propagates. In many textbooks, it is symbolically written as Λ

Answer 2

Answer:

refractive index x path-length

but not sure