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Formation of Rainbows

If total inte...

Question

If total internal reflection takes place only when light ray moves from optical denser to optical rarer...
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.?

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Solution

During rainbow formation total internal reflection takes place when light enters from water drop to air that is from denser medium to rarer medium which is the principle of total internal reflection.( not as you mentioned )

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Total Internal reflection happens only when light is travelling from an optically denser medium to an optically rarer medium.

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

Q. Total internal reflection occurs only when the ray travels from an optically denser to rarer medium.

Q. Total internal reflection can take place only if
(a) light goes from optically rarer medium (smaller refractive index) to optically denser medium
(b) light goes from optically denser medium to rarer medium
(c) the refractive indices of the two media are close to each other
(d) the refractive indices of the two media are widely different.

Q. Which of the following conditions are necessary for total internal reflection to take place at the boundary of two optical media ?
1. Light is passing from optically denser medium to optically rarer medium.
2. Light is passing from optically rarer medium to optically denser medium.
3.Angle of incidence is greater than the critical angle.
4.Angle of incidence is less than the critical angle.

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