When an object is placed at a distance o...

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.

`20cm` convex

`20cm`, concave

`10cm`, convex

`10cm` concave

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