An object is placed in front of a symmetrical convex lens with refr...

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An object is placed in front of a symmetrical convex lens with refractive index 1.5 and radius of curvature \( 40 \mathrm{~cm} \). The surface of the lens further away from the object is silvered. Under auto-collimation condition,
P the object distance is
(A) \( 20 \mathrm{~cm} \)
(B) \( 10 \mathrm{~cm} \)
(C) \( 40 \mathrm{~cm} \)
(D) \( 5 \mathrm{~cm} \)
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