For total internal reflection to occur at the core-cladding boundary in an optical fibre, which condition must be satisfied for a light ray travelling from the core towards the cladding?

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Physics · Ray Optics

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Angle of incidence must be greater than the critical angle

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Answer 1

Angle of incidence must be less than the critical angle

Answer 2

Angle of incidence must be greater than the critical angle

Answer 3

Light must travel from a rarer medium to a denser medium

Answer 4

The refractive indices of the core and cladding must be exactly equal

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