Answers

2016-01-16T16:27:12+05:30
Critical angle is the angle of incidence in denser medium , for which the angle of refraction in the rarer medium is 90°.
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2016-01-16T16:30:10+05:30
The smallest angle of incidence for which light is totally reflected from a boundary between one medium and a less refractive one or
The smallest angle of incidence at which a light ray passing from one medium to another less refractive medium can be totally reflected from the boundary between the two.
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