When light travels from a denser medium to a rarer medium at a critical angle, the phenomenon that occurs is called:
Q1. When light travels from a denser medium to a rarer medium at a critical angle, the phenomenon that occurs is called:
Answer: Total internal reflection
Explanation: Total internal reflection occurs when light travelling from a denser medium (e.g., glass or water) to a less dense medium (e.g., air) hits the boundary at an angle of incidence equal to or greater than the critical angle, so that no refracted ray exits.