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When the rectangular metal tank is filled to the top with an unknown liquid, as observer with eyes level with the top of the tank can just see the corner E; a ray that refracts towards the observer at the top surface of the liquid is shown. The refractive index of the liquid will be

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1.2

1.6

1.4

1.9

answer is A.

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Detailed Solution

Light ray is going from liquid (Denser) to air (Rarer) and angle of refraction is 90^o, so angle of incidence must be equal to critical angle. solution

$SinC = 4 / 5 = \frac{1}{μ} μ = \frac{5}{4} = 1.25$

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