A ray of light is incident at the glass-water interface at an angle i. It merges finally parallel to the surface of the water. Then, the value of μg would be(where μg is the refractive index of glass with respect to water)
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Correct option is B)
Applying Snell's law at glass-water surface, gwμ=sinisinr=wμgμ...(i) Applying Snell's law at water-air surface, waμ=sinrsin90∘=aμwμ...(ii) Multiplying (i) and (ii), aμgμ=sini1⇒gμ=sini1.