Drag the index of refraction slider for both mediums and then observe the position of the ray with respect to the normal. In the table below, record the refractive indices for both mediums and then record whether the ray in each case is toward or away from normal. The first row is filled for you.

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.