Q. It is possible to observe total internal reflection when a ray travels from:

A
air into water
B
air into glass
C
water into glass
D
glass into water
Solution:

Total internal reflection occurs only when light goes from a denser medium to a rarer medium.
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.

Optical fibres works on the principle of total internal reflection.

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