On entering in a medium from air, the speed of light becomes half of it's value in air.Find the refractive index of that medium with respect to air?
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it will becomes 2 times because in the expression Refractive Index=C/V C=constant So R.I. is inversely proportional to the speed of light.
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all are explained in the attached photo.
here, eta is the refractive index.
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