A What object distance is required to give an image with a m

A) What object distance is required to give an image with a magnification of +2.0? Assume that the focal length of the lens is +6.2 cm . d_o = _____cm

B) What is the location of the image in this case? d_i = ____cm

Solution

m = -v/u

=> v = -2u

1/f = 1/v + 1/u = 1/v - 2/v

=> V = -6.2 cm

=> virtual image is formed at 6.2 cm from lens