1.

What should be the distance between an object and a concave mirror of the focal length of 20cm so that a virtual image is produced at a distance of 10 cm from the mirror? Also, justify your answerA.12cmB. 6.6cmC. 30cmD. 25cmE.None of these

Answer» Here object distance (u) = ?

Image distance (v) = -10 cm(for virtual image)

Focal length = -20 cm (for concave mirror)

Mirror formula

1/v +1/u=1/f

=>-1/10+1/u = -1/20

=> 1/u = 1/10-1/20=+1/20

=> u = +20 cm

Here + sign means the object is virtual.

option E is acceptable


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