Question

Total internal reflection can occur when lights passes from:
(a) a denser to rarer medium
(b) a rarer to denser medium
(c) one medium to another of equal refractive index
(d) medium to another of equal absorption coefficient

Answer 1

hello there your answer
option a denser to rarer medium
hope it helps you. ...

Answer 2

Total internal reflection occurs when light passes through a denser medium to a rarer medium.
There is another condition required for total internal reflection.
That is the angle of incidence must be greater than the critical angle.
angle i > angle c

So, the answer is option (a).

Hope this helps you.