Question

At exactly the critical angle:
a) all light reflects back into the n1 medium
b) all light reflects back into the n2 medium
c) part of the light reflects back into the n1 medium, the remainder travels along the boundary between the two mediums
d) part of the light reflects back into the n2 medium, the remainder travels along the boundary between the two mediums

Answer 1

C

Answer 2

Source: http://www.physicsclassroom.com/class/refrn/Lesson-3/The-Critical-Angle

Answer 3

thanks!