Question

2 times magnified image is produced by mirror of focal length 10 cm . Two possible positions of an object from mirror are *
Options are
15 cm and 30 cm
5 cm and 30 cm
5 cm and 15 cm
15 cm and 20 cm

Answer 1

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Given that a concave mirror produce two times magnified real image of an object.

Object distance, u = 10 cm

The magnification of a concave mirror is given by :

m=$\dfrac{-v}{u}$

For real image, m = -2

So,

-2=$\dfrac{-v}{10\ cm}$

v = 20 cm

The image is formed at a distance of 20 cm.

Hence, this is the required solution.

• Option D) 20Cm and 15Cm

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Answer 2

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Option D 20 and 15 cm.