38 In the diagram below, a ray of light enters a transparent medium from air. If angle X is 45° and angle Y is what is the absolute index of refraction of the medium ?

i think the answer is a, hope this : )

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.