A convex lens has a focal length `f`. It is cut into two parts along the dotted line as shown in figure. The focal length of each part will be

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.

Find the focal length of the lens as shown in figure.

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

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 ?

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