A plano - convex lens made of material of refractive index \( \mu \) with radius of curvature \(...

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A plano - convex lens made of material of refractive index \( \mu \) with radius of curvature \( R \) is silvered on the curved side. How far away from the lens-mirror must you place a object so that the image coincides with the object
[KVPY 2011]
(a) \( \frac{R}{\mu} \)
(b) \( R \)
(c) \( \frac{R}{\mu-1} \)
(d) \( \mu R \)
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