Question

differentiate between optical length and geometrical length?​

Answer 1

Explanation:

The optical path length is simply the distance the light travels times the refractive index. For example, light traveling through 10 cm of water has an optical path length of 10 x 1.333 or 13.3 cm. The geometric length is simply the physical distance the light travels.

Answer 2

Answer:

the optical path length is complete distance the light travels time the refractive index whereas a geometrical length is simply the physical distance the light travels.