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A point source S is placed at the bottom...

A point source S is placed at the bottom of a 12 mm high transparent block of diamond ( refractive index = 2.4 ) . The block is immersed in an optically rarer liquid as shown in the figure. It is found that the light emerging from the block to the liquid forms a circular bright spot of diameter 18 mm on the top of the block. What is the refractive index of the liquid ?

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The correct Answer is:
`01.44`
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