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When an object is placed at a distance of 25 cm from a mirror, the magnification is `m_(1)`. The object is moved 15cm farther away with respect to the earlier position, and the magnification becomes `m_(2)`. If `m_(1)//m_(2)=4` , then calculate the focal length of the mirror.

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Concave, 20 cm
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AAKASH SERIES-RAY OPTICS-PROBLEMS ( LEVEL-II)
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  7. The u-v curve in a concave mirror as shown in figure. Find the f...

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