A concave mirror produces a real image that is three times aslarge as the object

Question

A concave mirror produces a real image that is three times aslarge as the object. If the object is 22 cm in frontof the mirror, what is the image distance? What is the focal length of thismirror? A concave mirror produces a real image that is three times aslarge as the object. If the object is 22 cm in frontof the mirror, what is the image distance? What is the focal length of thismirror? If the object is 22 cm in frontof the mirror, what is the image distance? What is the focal length of thismirror?

Explanation / Answer

Given that      hi = 3 ho A) do = 22 cm      We know that magnification                hi / ho = - di /do ==> di = - (-hi *do / ho)                  = 3 * ho * 22 / ho                  = 66 cm B) We know that         1 / f = 1 /do + 1 /di                = 1 / 22    +1 / 66                = 0.03333 ==> f = 16.50 cm

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