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The radius of curvature of curved surface of a thin plano-convex lens is `10 cm` and the refractive index is `1.5`. If the plano surface is silvered,

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The radius of curvature of curved surface of a thin plano-convex lens is `10 cm` and the refractive index is `1.5`. If the plano surface is silvered, then the focal length will be.
A. 10.5 cm
B. 10 cm
C. 5.5 cm
D. 5 cm
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Correct Answer - b
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