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What will be the time taken by a ray of light travelling from one point to another, by any number of refractions & reflections follows that particular path?

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in Engineering Physics II by (679k points)
What will be the time taken by a ray of light travelling from one point to another, by any number of refractions & reflections  follows that particular path?

(a) Highest

(b) Least

(c) Maximum

(d) Moderate

I had been asked this question during an online exam.

My doubt stems from Dispersion, Fermat’s Principle & its Application in division Optics of Engineering Physics II

1 Answer

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Best answer
Correct choice is (b) Least

Explanation: In different materials light travels at different speed. When a beam of light passes from one material to another it bends in such a way, that the path it takes from one point to another, requires the least possible time.

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