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

ICSE BoardEnglish MediumSTD 10PhysicsRefraction of Light at Plane Surfaces2 Marks
Question
What is total internal reflection?
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Answer

Total internal reflection: It is the phenomenon when a ray of light travelling in a denser medium, is incident at the surface of a rarer medium such that the angle of incidence is greater than the critical angle for the pair of media, the ray is totally reflected back into the denser medium.

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