Some time later, you look through an arbitrary window and see a slew of tiny white lights rushing by. All the lights appear to move as one group. That is, they all appear to move at one speed and in one direction. You are just looking out the window for the first time, so you do know when, if ever, the lights had begun to behave in this manner. Required:
Draw a neat and clear sketch of what you see through the window. Use arrows of thoughtfully chosen sizes and directions to indicate any motion you observe.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

at right angles to each other