An equiconvex lens has power P. It is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be, (1) P (2) 0 (3) \frac{\mathrm{P}}{2} (4) \frac{\mathrm{P}}{4}
An equiconvex lens has power P. It is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be, (1) P (2) 0 (3) \frac{\mathrm{P}}{2} (4) \frac{\mathrm{P}}{4}

Answer (1)

When a lens is cut in half as illustrated in the diagram, the power of each half is the same. i.e. P, because the focal length is the same.