if the image of an object formed by a concave mirror is the half of the size of the object prove that the object is at a distance of 3f from the mirror where f is the focal length of the mirror.
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convex mirror has a focal length f. ... If the focal length of a convex mirror is 3m and an object is placed at 5m, then what .... It's image is formed at a distance of 18cm from the mirror .
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