Question

If a biconvex lens of power P is cut into 3 parts horizontally , then power of each part is?

Answer 1

The focal length will remain constant if a convex lens is cut in half horizontally because the focal length of a lens depends on its two radii of curvature and the material of the lens. As no change in the material or curvature occurs, the focal length of the lens will remain constant.
P=1/f=const.
Thus, then power of each part is P.