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Lens Formula and Magnification

A virtual, er...

Question

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 cm
Give reason for your choice

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Solution

The object must be kept at a distance of 10 cm from the concave mirror in order to produce a virtual, erect and magnified image. The reason being, a concave mirror forms a virtual, erect and magnified image when an object is placed between the focus and the pole.

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