Effective index of a medium does not depend upon the angle of incidence. It depends upon the nature of the medium. Refractive index of a medium may also be defined as the ratio of the speed of light. The speed of light in vacuum is almost equal to the speed of light in air, therefore, we use the speed of light in air instead of speed of light in vacuum, calculating the refractive index of a medium. For example, city of light in water is 2.26 x 10⁸ m/s, yes it is 3 x 10⁸ m/s in air, so
Refractive index of diamond = speed of light in air divided by speed of light in diamond
Regards: Abdul Rafay from Pakistan, Karachi...
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The index of refraction of Ruby is less than the index of refraction of diamond. Why?
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1 answer