When a beam passing into the Middle from the vacuum, or passing from one medium to another medium, one. The light will not change, but a change of frequency, wavelength, because the speed of change. In the case of light so that it cannot fall angle perpendicular to the surface of the new light runner approach. The direction of light is refraction. An example of this phenomenon of refraction, like the glass lens magnification. Contact lenses Microscope glasses binoculars
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