Question

A ray of light will undergo total internal reflection if it *
a) Goes from denser to rare medium
b) Incident at an angle less than the critical angle
c) Strikes the interface normally
d) Goes from rare medium to denser medium​

Answer 1

Total internal reflection from rarer to denser medium

Total internal reflection can only happen when light ray travel from denser medium . by the laws of refraction whenever light ray travel from denser to rarer it get away from the normal .