The light propagates in a homogeneous medium in a straight line at a constant speed. In vacuum, this speed is 299 792 458 m / s and is marked with the letter C. The material in the centers of the light travels at a slower speed, for example, water has a value of 224 799 383 m / s
Falling on the boundary of two media material, light can be absorbed, scattered, reflected and refracted. Which of these events occurs, depending on the type of material encountered by the light beam. Frequently we are dealing with partial absorption and scattering of light. If, however encounters the surface is polished metal surface, then there is an almost perfect reflection of the phenomenon.
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