The correct option is B. According to Einstein, in his special theory of relativity, a moving clock runs more slowly as its velocity increases until it gets to the speed of light and it stops running altogether. Thus, the clock that is travelling the fastest will have the slowest passage of time while the one that is travelling the slowest will have the fastest passage of time.
Newton's ring equation relates the initial and final diameter of the ring, to the index of refraction of the air and the index of refraction of the liquid between the lens and the plates, as follows:
Solving for :
Recall that the refractive index of the air is 1. So, replacing the given diameters: