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An object is placed in front of a mirror at a distance of `60cm`. If its two times diminished image is formed on the screen, the focal length of the mirror isA. `20cm`B. `45cm`C. `15cm`D. `90cm` |
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Answer» Correct Answer - A `M=(-v)/(u)=(-1)/(2)impliesv=(u)/(2)=-30cm` `(1)/(f)=(1)/(v)+(1)/(u)impliesf=-20cm` |
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