A convex mirror produces a magnification of `1//2` when the object is placed at a position A and a magnification of `1//3` when the object is at a pos
A convex mirror produces a magnification of `1//2` when the object is placed at a position A and a magnification of `1//3` when the object is at a position B. If the separation between the positions A and B be 30 cm, what is the focal length of the mirror ?
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