Question

Write fermat's principal of light ​

Answer 1

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Fermat's principle, in optics, statement that light traveling between two points seeks a path such that the number of waves (the optical length between the points) is equal, in the first approximation, to that in neighbouring paths. ... It is useful in the study of optical devices

Answer 2

Explanation:

Fermat's principle, in optics, statement that light traveling between two points seeks a path such that the number of waves (the optical length between the points) is equal, in the first approximation, to that in neighbouring paths. ... It is useful in the study of optical devices.