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Total interna...

Question

Total internal reflection takes place when a light ray propagates from _ to _ medium.

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Solution

Total internal reflection takes place when a ray of light propagates from $d e n s e r$ to $r a r e r$ medium and angle of incidence is greater than Critical angle.

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Q. Total internal reflection occurs when a ray of light passes from a ________ medium to a ____________ medium.

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But during rainbow formation total internal reflection takes place when light enters from air to a water drop that is from rarer medium to denser medium which is the exact converse...
what is it happening this way.?

Total internal reflection of a ray of light is possible when the ( $i_{c}$ = critical angle, $i$ = angle of incidence)

Q. Total internal reflection can happen only when light ray passes from denser to rarer medium.

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