Answer:
Approximately .
Explanation:
The refractive index of the air is approximately .
Let denote the refractive index of the glass block, and let denote the angle of refraction in the glass. Let denote the angle at which the light enters the glass block from the air.
By Snell's Law:
.
Rearrange the Snell's Law equation to obtain:
.
Hence:
.
In other words, the angle of refraction in the glass would be approximately .
Volocity can be the wave length of the speed like the volume.
Every point on the surface must have the same rotational speed.
Otherwise some places would rotate away from other places.
If the next block of your city rotated faster than the block that you live on,
then you could sit at home, look out the window, and watch your school
rotate past your house.
The map of the continents on the Earth would change constantly.