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The angle of incidence of a ray for which the angle of refraction is 90° is called ____?

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The angle of incidence of a ray for which the angle of refraction is 90° is called ____? Answer: Critical Angle

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This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.