Question

1) Explain what is optical path length. How
is it different from actual path 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.

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Answer 2

Explanation:

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 passes

diffrence that

actual path length is actul distance travelled by light which does not have to do antpy thing with refrective index of system

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