What conditions are required for total internal reflection?

Question

What conditions are required for total internal reflection? — Exam MCQ

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B. Light travels from a denser to a rarer medium with incidence angle greater than the critical angle — Total internal reflection requires travel towards a lower-index medium and an incidence angle exceeding the critical angle.

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A. Light travels from a rarer to a denser medium at 90°

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C. Both media have equal refractive indices

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D. Light strikes an interface between different-index media at 90°

What conditions are required for total internal reflection?

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