A concave mirror of focal length f produces an image P time the size of the object. If the image is real, then the distance of the object from the mirror is

Question

A concave mirror of focal length f produces an image P time the size of the object. If the image is real, then the distance of the object from the mirror is, P - 1 f, P + 1 f, P - 1 P f, P + 1 P f

MARKS App · Accepted Answer

Given, Magnification, M = I O = - v u = - P Or v = u P . Using mirror's formula, 1 v + 1 u = 1 f Here, the image of the real object is also real, therefore, v.u.f, all are on the negative side. Hence, 1 - u P + 1 - u = 1 - f ⇒ 1 u 1 P + 1 = 1 f ⇒ u = P + 1 P f

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