I believe this is called refraction. Reflection is when light will bounce off in the same in angle in the opposite direction. I believe refraction is when the light will bend and go off at a different angle.
Refraction is the change in direction and speed that a wave experiences when passing from one medium to another with a different refractive index. When the light passes from one transparent medium to another there is a change in its direction due to the different speed of propagation that the light has in the different material media.
This is a kinematic problem that asks us to determine the velocity of an object in a time frame given the plot of time in the x-axis and distance,x, in the y-axis. The figure that shows the behavior of the object is shown in the diagram. Segment C is going down which means the object is decelerating indicated by the negative slope. E on the other hand also has a negative slope as the line is also going down but less steep than that of c. slope is equal to change in y over the change in x. So given a definite change in y, a shorter change in x would make a greater slope, hence, becoming steeper. The speed then is C is higher than the speed in E.