Light travels from crown glass, with a refractive index of 1.52, into water, having a refractive index of 1.33? The critical angle for this interface is closest to which one of the following angles?
A) 42
B) 48
C) 53
D) 57
E) 61
Question 2
Light enters a substance from air at 30.0 to the normal. It continues within the substance at 23.0 to the normal. What is the critical angle for this substance when it is surrounded by air?
A) 53
B) 51.4
C) 36.7
D) 12.6