When light travels from air into water which is more dense than the air , it’s speed is lower. So the light wave will
A. bend towards the normal to the surface
B.-always lies along the normal to the surface
C. be unaffected
D. bend away from the normal to the surface

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?