When a ray of light enters from one medium to another, its velocity is doubled. The critical angle for the ray for two internal reflections will be
A. 30°
B. 60°
C. 90°
D. Information is incomplete
Answer:A
When a ray of light enters from one medium to another, its velocity is doubled. The critical angle for the ray for two internal reflections will be
A. 30° B. 60° C. 90° D. Information is incomplete