what is known as critical angle?
Asked by | 6th Mar, 2008, 12:54: PM
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.
Answered by | 7th Mar, 2008, 08:58: AM
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