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A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length 12 cm. Which of the following object distance should be chosen for this purpose?(i) 10 cm (ii) 15 cm (iii) 20 cmGive reason for your choice.
For this purpose, the object distance should be chosen 10cm from the concave mirror in order to produce a virtual, erect and magnified image. Because, a concave mirror forms a virtual, erect and magnified image when an object is placed between the focus and the pole. And, here the 10cm is the only distance that is less than the focal length of the mirror that is 12cm.
Explanation
When an object is placed within the focus i.e., between the pole $P$ and the focus $F$ of a concave mirror, a virtual, erect and magnified image is formed behind the mirror.
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