Physics, 20.08.2019 23:00 catt707p38uu0

An object is placed to the left of a convex mirror, such that the object-to-image distance is 140 cm.
find the focal length of the mirror, if the image is 35 cm from the mirror.
explain step by step as i do not know how to do this properly. you!

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An object is placed to the left of a convex mirror, such that the object-to-image distance is 140 cm...