A concave mirror for face viewing has a focal length of 0.4 m . The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is

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m = 5 = - v u ⇒ v = - 5 u f = - 0 .4 m From mirror formula, 1 v + 1 u = 1 f 1 - 5 u + 1 u = 1 - 0 .4 - 1 + 5 5 u = 1 - 0 .4 u = 4 5 - 0 .4 = - 0 .32 m So, distance of object from mirror = 0.32 m

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