50. 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 ?

50. 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 ?

\( (a) \ P \)  

\( (b) \ 0 \)  

\( (c) \ \frac{P}{2} \)  

\( (d) \ \frac{P}{4} \)

Answer :  \( (a) \ P \)