Question

What is total internal reflection ?..

Answer 1

Total internal reflection is a phenomenon that happens when a propagating wavestrikes 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. The critical angle is the angle of incidence above which the total internal reflectance occurs. This is particularly common as an optical phenomenon, where light waves are involved, but it occurs with many types of waves, such as electromagnetic waves in general or sound waves

Answer 2

The phenomenon due to which a ray of light traveling from an optically denser medium to an optically rarer medium comes back to that optically denser medium after striking at the surface of interface is called total internal reflection.

There are two conditions required for its occurrence. They are :-
(I) The ray of light should travel from an optically denser medium to optically rarer medium.
(ii) The angle of incidence should be more than the critical angle of that medium.


Remember:- MORE THE REFRACTIVE INDEX, LESS WILL BE THE CRITICAL ANGLE, AND MORE WILL BE THE CHANCE FOR THE OCCURRENCE OF TIR ( TOTAL INTERNAL REFLECTION)....


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