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A concave mirror has a radius of curvatu...

A concave mirror has a radius of curvature of 24 cm. How far is
an object from the mirror if an image is formed that is:
(a) virtual and 3.0 times the size of the object,
(b) real and 3.0 times the size of the object and
(c) real and `1//3` the size of the object?.

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