The movement of the light in different types of media have different speed, as if the air is moving light speed, as 300, 000 000 per second. But if the moving light in the glass or plastic is about 200 000 speed,,000 per second. Changing the speed of light when through a medium different cause refraction. Speed of light in a vacuum to the speed of light in any medium, called the refractive index of the medium, it
.Index of refraction = speed of light in a vacuum. Speed of light in any medium (the speed of light in vacuum
= 3 x 108 meters / sec)
.
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