Question

At what distance from a concave mirror of focal length 10cm an object be placed to obtain a two times magnified image?

Answer 1

Answer:

m = IO = -vu = ± 2 Case - 1 u = 2v 1u + 1v = 1f 1u + 12u = -110 u = - 15 cmcase - 2 u = - 2v 1u - 12u = -110 2 - 12u = -110 u = - 5cm u = - 5 or - 15