A point object O is placed on the principal axis of a convex lens of focal length f = 20 cm. at a distance of 40 cm. to the left of it. The diameter of the lens is 10 cm. An eye is placed 60 cm. to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is:
A.) 0
B.) 2.5 cm.
C.) 5 cm.
D.) 10 cm.

The answer is given as B.) 2.5 cm.

Please solve the problem giving all the steps.

Question

A point object O is placed on the principal axis of a convex lens of focal length f = 20 cm. at a distance of 40 cm. to the left of it. The diameter of the lens is 10 cm. An eye is placed 60 cm. to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is:
A.) 0
B.) 2.5 cm.
C.) 5 cm.
D.) 10 cm.

The answer is given as B.) 2.5 cm.

Please solve the problem giving all the steps.