Question

In vacuum optical path is ______ a) equal to actual path travelled b) less than actual path travelled c) greater than actual path travelled d) infinite ​

Answer 1

Answer:

a is the answer

Explanation:

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Answer 2

In vacuum optical path is equal to actual path travelled :

Explanation:

• The optical path length is equal to the product of the the actual path length and refractive index of the medium.

• The actual path duration is likewise referred to as the geometric path length.

• The optical path duration in a medium is the corresponding path in a vacuum that the light travels on the identical time because it takes withinside the given medium.
• Therefore the distance (d) travelled in a medium of refractive index (n) then the  a path difference = nd - d is equal to d (n - 1) over a ray travelling equal distance through vacuum.

Option(A) is the correct choice