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