Concept Simulation 25.3 illustrates the concepts pertinentto this problem. A con

Question

Concept Simulation 25.3 illustrates the concepts pertinentto this problem. A convex mirror has a focal length of -31.0 cm. A12.0-cm-tall object is located 31.0 cm in front of this mirror.Determine the (a) locationand (b) size of the image.

Explanation / Answer

Given that        f = - 31.0 cm        ho = 12.0 cm        do = 31 cm (a) We know that       1 / f = 1 / do + 1 /di    ==> 1 / di = 1 / f   - 1 /do                     = - 1 / 31 - 1 / 31                     = - 2 / 31    ==> di = - 15.5 cm (b) we know that            hi /ho = - di / do        ==> hi = - di * ho / do                   = - (-15.5) * 12 / 31                   = 6.0 cm

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