Question

Explain with suitable example when light gets reflected from a surface ,it selects the park that take place less time ?

Answer 1

Answer:

Fermat's principle states that “light travels between two points along the path that requires the least time, as compared to other nearby paths.” From Fermat's principle, one can derive (a) the law of reflection [the angle of incidence is equal to the angle of reflection] and (b) the law of refraction [Snell's law].

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When you shine a beam of light from one material into another (like from air to water) it bends in such a way that the path it takes from one point to another requires the least possible time. Taking a straight line means traveling through a lot of the “slow material”. The path of “least time” is in between.

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