An object \( 1 \mathrm{~cm} \) tall is placed \( 4 \mathrm{~cm} \) in front of a mirror. In orde...

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An object \( 1 \mathrm{~cm} \) tall is placed \( 4 \mathrm{~cm} \) in front of a mirror. In order to produce an upright image of \( 3 \mathrm{~cm} \) height one needs a
(A) Convex mirror of radius of curvature \( 12 \mathrm{~cm} \)
(B) Concave mirror of radius of curvature \( 12 \mathrm{~cm} \)
(C) Concave mirror of radius of curvature \( 4 \mathrm{~cm} \)
(D) Plane mirror of height \( 12 \mathrm{~cm} \)
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