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On entering in a medium from air, the sp...

On entering in a medium from air, the speed of light becomes half of its value in air. Find the refractive index of that medium with respect to air.

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Here speed of ligh in medium `upsilon = (1)/(2)xx` speed of light in air `=(c )/(2)`
`therefore` Refractive index of medium w.r.t. air, `n=(c )/(upsilon)=(c )/((c//2))=2`
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