Identical rays of light in air are refracted upon entering three transparent materials: A, water, where the

Question:

Identical rays of light in air are refracted upon entering three transparent materials: A, water, where the speed of light is 0.75c; B, ethyl alcohol (speed 0.7 c); C, crown glass (speed 0.6c). Rank the materials according to how much the light ray bends toward the normal, from most bending to least bending.