Physics · Optics
For total internal reflection to occur at the core-cladding boundary inside an optical fibre, which condition must be satisfied?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The refractive indices of the core and cladding must be exactly equal.
- 2Light must travel from a rarer medium to a denser medium, and the angle of incidence must be greater than the critical angle.
- 3Light must travel from a denser medium to a rarer medium, and the angle of incidence must be greater than the critical angle.✓
- 4Light must travel from a rarer medium to a denser medium, and the angle of incidence must be less than the critical angle.
Correct answer
Light must travel from a denser medium to a rarer medium, and the angle of incidence must be greater than the critical angle.
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