1.
Total internal reflection occurs when light travels from:
A
Rarer to denser medium at any angle
B
Denser to rarer medium below critical angle
C
Denser to rarer medium at or above the critical angle
D
Rarer to denser medium above critical angle
Answer and explanation
Correct Answer: C — Denser to rarer medium at or above the critical angle
Total internal reflection occurs when light passes from a denser to a rarer medium at an angle equal to or greater than the critical angle. It is the principle behind optical fibres.