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One of the surfaces of a biconvex lens o...

One of the surfaces of a biconvex lens of a focal length 10 cm is silvered as shown in figure. Radius of curvature of silvered surface is 10 cm. At a given instant, if speed of object is 1m/s, then the speed of image at that instant is `(10+alpha)` m/s. What will be the value of `alpha`? `(mu=1.5)`

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