Question
Question: The velocity of light in a medium is half its velocity in air. If ray of light emerges from such a m...
The velocity of light in a medium is half its velocity in air. If ray of light emerges from such a medium into air, the minimum angle of incidence, at which it will be totally internally reflected, is-
A
150
B
300
C
450
D
600
Answer
300
Explanation
Solution
m = C/2C= 2 so for TIR, i ³ C
sin i ³ sin C Ž sin i ³ μ1 or i ³ 300