alleryTotal internal reflection occurs when light travels from:
ARarer to denser at any angle
BDenser to rarer above critical angle
CSame medium reflecting normally
DDenser to denser without bending
Answer & Solution
Correct answer: B. Denser to rarer above critical angle
1. TIR requires light to travel from a DENSER to a RARER medium.
2. AND the angle of incidence must EXCEED the critical angle θ_c, where sinθ_c = n_rare / n_dense.
3. Used in optical fibres, prismatic binoculars, mirages.
_Source: syllabus Science Ch 9 §9.3.4 Total Internal Reflection_
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