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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. 60 cmC. 90 cmD. 120 cm |
Answer» Correct Answer - C Given, `f=+30 cm` and `m=(1)/(4)` Magnification, `m=(f)/(f-u)` `therefore " " (30)/(30-u)=(1)/(4)` `" " 30-u=120 rArr u =- 90 cm` |
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