What would be the refractive index of the liquid in the given figure?
A
√23
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B
√34
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C
√43
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D
√32
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Solution
The correct option is D√32 Angle of incident and the angle of refraction are the angles which the incident ray and the refracted ray make with the normal. ∴ Angle of incidence = 90∘−30∘=60∘
Angle of refraction = 90∘−45∘=45∘ So, i=60∘ and r=45∘
By Snell's law siniμ1=sinrμ2
or sin60∘×1=sin45∘×μ2 [∵ Refractive index of air is taken as 1]
or, μ2=sin60sin45=√321√2=√32