Question

What distance should be an object be placed from a convex lens of focal length 18cm to obtain an image at 24 cm from the lens. What will be the magnification produced in this case.

Answer 1

(1/24)-(1/u) = (1/18)
1/u = (9-12)/216
1/u = -3/216
u= -72 cm

magnification = v/u
m= 24/-72
= -0.33