At what distance should an object be placed from a convex lens of focal length 18 cm to obain an image at 24 cm from it one the other side? What will be the magnification produced in this case?

Explanation

u=? , f=18 cm , v=24 cm, m=?
1/v-1/u=1/f
u=-72 cm
m=-72/74=-3
Ray diagram