Answers

2015-12-23T11:08:58+05:30
Critical angle is the smallest angle of incidence for which light is totally reflected.

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2015-12-23T13:51:59+05:30
The angle of incidence corresponding to which the angle of refraction is 90° is called the critical angle between the pair of media concerned .The critical angle of a pair of media depends on the colour of the incident light and the nature of the two media.
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