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CBSE Class 10 Answered

what is known as critical angle?
Asked by | 06 Mar, 2008, 12:54: PM
answered-by-expert Expert Answer

Critical angle: The maximum angle of incidence that can be formed by a light ray in passing from a dense medium to a less dense medium. The angle is measured between a ray and a perpendicular erected at the intersection of the ray with the surface of the medium. The critical angle of an air-glass surface is about 42 degrees.

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Answered by | 07 Mar, 2008, 08:58: AM
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