1.

The image formed by a convex mirror of focal length `30 cm`. is a quarter of the object. What is the distance of the object from the mirror ?A. 30 cmB. 90 cmC. 120 cmD. 60 cm

Answer» Correct Answer - B
(b) Magnification, m`=(f)/(f-u)`
`rArr (+(1)/(4))=(+30)/(+30-u)`
`rArr` The distance of the object from the mirror,u=-90 cm


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