A small object is placed \( 10 \mathrm{~cm} \) in front of a plane mirror. If you stand behind t...

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A small object is placed \( 10 \mathrm{~cm} \) in front of a plane mirror. If you stand behind the object \( 30 \mathrm{~cm} \) from the mirror and look at its image, the distance focused for your eye will be
(A) \( 60 \mathrm{~cm} \)
(B) \( 40 \mathrm{~cm} \)
(C) \( 20 \mathrm{~cm} \)
(D) \( 80 \mathrm{~cm} \)
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