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A converging set of rays, travelling from water to air, is incident on a plane interface. In the absence of the interface, the rays would have converged to a point O, 60cm above the interface. However, due to refraction the rays will bend. At what distance above the interface will the rays actually converge? (Refractive index of water = $\frac{4}{3}$ )

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answer is A.

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Detailed Solution

Using , $\frac{μ_{1}}{d_{1}} = \frac{μ_{2}}{d_{2}}$

$\frac{\frac{4}{3}}{60} = \frac{1}{d_{2}} \Rightarrow d_{2} = 45 cm$

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