The refractive index for a glass is 1.62. The sine of the critical angle for total internal refection at a glass-air interface is:

The refractive index for a glass is 1.62. The sine of the critical ang

1.	The refractive index for a glass is 1.62. The sine of the critical angle for total internal refection at a glass-air interface is:
A.	0.40
B.	0.62
C.	0.74
D.	1.00
Answer» C. 0.74