NEET 2001 Physics question

Optical fibre are based on : -

(1)Total internal relfectionCorrect
(2)Less scattering
(3)Refraction
(4)Less absorbtion coefficient

Answer: (1)

Solution

An optical fibre has a core of higher refractive index surrounded by a cladding of lower refractive index. Light entering the core strikes the core-cladding boundary at angles larger than the critical angle and is repeatedly totally internally reflected,

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Question ID VK-088759