An equiconvex lens of focal length `15 cm` is cut into two equal halves in thickness. What is the focal length of each half ?

Focal length of a convex lens in air is 25 cm. It is cut into two equal halves along its principal axis. What will be the focal length of each half ?

A equiconcave lens of focal length 15 cm is cut into two equal havles along dotted lines as shown in figure. What will be new focal length of each half.

A diverging lens of focal length F is cut into two idential parts, each forming a plano concave lens, Fig. What is the focal length of each part ?

The figure shows and equiconvex lens of focal length f. It the lens is cut along PQ, the focal length of each half will be

If the convex lens of focal length 10 cm and a concave lens of focal length 50 cm are kept in contact with each other. What will be the focal length of the combination ?

If a convex lens of focal length 20 cm and a concave lens of focal length 30 cm are kept in contract with each other. What will be the focal length of the combination ?

A biconvex lens has a focal length of 10 cm. It is cut in half and two pieces are placed as shown. The focal length of the final combination is

An equiconcave diverging lens of focal length F is cut into two equal halves. The two halves are turned around and joined with some liquid between them.The lens obtained is converging with focal length F. If the refractive index of the liquid is 3 then what is the refractive index of the lens?