NDA 2019 Physics question

Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because

(A)the holes through the fibre are extremely fine.
(B)light rays are absorbed at the entry end and relieved at the exit end of the fibre.
(C)scattering of light occurs inside the fibre.
(D)successive total internal reflections occur as a ray moves through the fibre.Correct

Answer: (D)

Solution

Light entering the core of an optical fibre strikes the boundary with the cladding at an angle greater than the critical angle and is totally internally

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Question ID VK-031477