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WHAT IS REFRACTIVE INDEX OF GLASS PRISM?

In optics the refractive index or index of refraction n of a substance (optical medium) is a dimensionless number that describes how light, or any other radiation, propagates through that medium. It is defined as,where c is the speed of light in vacuum and v is the phase velocity in the substance. For example, the refractive index of water is 1.33, meaning that light travels 1.33 times as fast in vacuum as it does in water.