A double convex lens of focal length is cut into 4 equal parts One cut is perpendicular to the axis and the other is parallel to the axis of lens. The focal length of each part is

A double convex lens of focal length f is cut into 4 equivalent parts. Both the cuts are mutually perpendicular and parallel to the principal axis. Focal length of each part is

The focal length of a convex lens is

If a equiconvex lens of focal length f is cut into two halves by a plane perpendicular to the principal axis, then

If a equiconvex lens of focal length f is cut into two halves by a plane perpendicular to the principal axis, then

An equiconvex lens of focal length20 cm is cut into two equal halves perpendicular to the principal axis and kept at a separation of 10 cm co-axially. What ils the focal length of the each part is?

A symmetrical biconvex lens of focal length f is cut into four identical pieces along its principal axis and to the perpendicular to principal axis. The focal length of one of four pieces is