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Refraction of Light at Plane Surfaces — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsRefraction of Light at Plane Surfaces1 Mark
Question
A light ray is incident from a denser medium on the boundary separating it from a rarer mediuma an angle of incident equal to the critical angle, what is the angle of refraction for the ray?
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Answer

When a ray is incident from a denser medium to a rarer medium at angle equal to critical angle (i=ic), the angle of refraction becomes 90°

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