At what distance should an object be placed from a convex lens of focal length 18cm to obtain an image at 24cm if on the other side. What will be the magnification produced in this case?
By using lens formula
1v−1u=1f
where v=24cm ,f=18cm
124−1u=118
from this we get u=−72cm
magnification of lens is m=vu
m=24−72=−13