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Figure shows a glass (mu(g) = 1.5) vesse...

Figure shows a glass `(mu_(g) = 1.5)` vessel, partly filled with water `( mu_(w) = (4)/(3))` . A ray of light is incident normally on the water surface and passes straight through. The vessel is tilted slowly till angle `theta` such that the light ray is emergent grazing the lower surface of the glass. Find `theta`.

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The correct Answer is:
`theta = sin^(-1) ((3)/(4))`
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