If the index of refraction of a medium is 1.4 determine the speed of light in that medium

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

As the distance from a magnet increases, what happens to the magnet force?