Nothing. It continues to travel in a straight line.
what happens to interstellear gas as it passes through a spiral density wave
Light passes thru, gets absorbed or is reflected dependent on the wavelength of light and the density of the plasma.
The result of a beam of light passing through a material relies entirely on the optical density of the material. If its density is lower than air, then the angle of incidence will be less (more acute) than the angle at which it enters. The opposite is true for a material with higher optical density.
This is due to the difference in optical density.
The optical density of a medium is not the same as its physical density. The physical density of a material refers to the mass/volume ratio. Optical density determines how much a light wave is slowed down as it passes through a medium. The more optically dense a material is, the slower that a wave will move through the material.The refractive index is a measurement of optical density. A medium with a low optical density, would have also a low refractive index.For example air, having a low optical density has a refractive index of 1.0003, whereas water, with a higher optical density, has a higher refractive index of 1.333.
Marginal rays are the light that passes through an optical system that is away from the optical axis.
I was also looking for the answer to this question. I decided to see what Wikipedia had to say about it, and found this: http://en.wikipedia.org/wiki/Absorbance This article kinda explains how they are related. Good luck!
When it passes through optical centre.
bend towards the normal or it's speed will decrease
less than the angle of refraction.
the food passes through
sh@@ happens