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Write the necessary conditions for the p...

Write the necessary conditions for the phenomenon of total internal reflection to take place. How does one account for the brilliance exhibited by a diamond when it is suitably cut ? 5

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(a) Conditions :- (i) Light should travel from optically denser medium to a rarer medium.
`" "` (ii) Angle of incidence should be greater than critical angle.
(b) By cutting the diamond suitably, multiple total internal reflection occur, once light enters the diamond it suffer a time lag before emerging out.
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