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Q)

The focal length of a Plano convex lens when plane surface is silvered and object is in front of curved surface is

$(a)\;\frac{R}{2 (y-1)} \\ (b)\;\frac{3R}{2(\mu-1)} \\ (c)\;\frac{R}{(\mu-1)} \\ (d)\;\frac{2R}{(\mu-1)} $

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