Q- A jewel thief hides a diamond by placing it at the bottom of a public swimming pool. He places a circular raft on the surface of the water directly above the diamond as shown in the figure. The surface of water is smooth and the pool is 2.0m deep. Find the minimum diameter d of raft if it is to prevent the diamond from being seen by the people not in wager. (Refractive index of water = 1.4)
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