Question

if total internal reflection do not occurs what are the consequences

Answer 1

hello friend here is your answer.
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Total internal reflection is the phenomenon which occurs when a propagated wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface. If the refractive index is lower on the other side of the boundary and the incident angle is greater than the critical angle, the wave cannot pass through and is entirely reflected. 
i hope it will help you.

Answer 2

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• If the incident angle is increased further at this point, then the refracted angle moves from the surface and back to the first media (water) given that it is now reflected.
• Here, it is no longer the refracted ray, but a reflected ray of light.
• As a result, total internal reflection occurs.

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