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Question

A vertical pencil of rays comes from bottom of a tank filled with a liquid. When it is accelerated with an acceleration of 7.5 m/s2, the ray is seen to be totally reflected by liquid surface. What is minimum possible refractive index of liquid?

A
slightly greater than 4/3
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B
slightly greater than 5/3
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C
slightly greater than 1.5
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D
slightly greater than 1.75
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