How is refractive index of any medium ‘A’ with respect to a medium ‘B’ related to the speed of propagation of light in two media A and B? State the name of this constant when one medium is vacuum or air.
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law of refraction that defines the refractive index of a medium with respect to the other is given by first law of refraction known as Snell's law. If one medium is vacuum or air then the constant is named as absolute refractive index of the medium.
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