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ntA plano-con...

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ntA plano-convex lens is silvered on its plane side and then it acts like a concave mirror of focal lenght 20cm, when the convex side is silvered it acts like a concave mirror of focal lenght 7 cm. The refractive index of the lens is __________.n

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Q. A plano-convex lens, when silvered on the plane side, behaves like a concave mirror of focal length

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