Question

Optical path is equal to
(A)
refractive index x path-length
(B)
refractive index / path-length
path-length / refractive index
path-length
(D)
refractive index x
D
1017-D​

Answer 1

Answer:

A is the right answer i think

Answer 2

Optical path = refractive index x path-length

Explanation:

The product of geometric length of the path followed by light through a given system and the refractive index of the medium through which it propagates. Also, the difference in optical path lengths between two paths is called optical path difference.

It can be calculated using equation :

$\mathrm {OPD} =d_{1}n_{1}-d_{2}n_{2}$

d₁ and d₂ are the distances of the ray passing through medium 1 or 2, and n₁ is the greater refractive index and  n₂ is the smaller refractive index.

So, the correct option is (A) "refractive index x path-length".

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Optical path

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