an equi-convex len has power P. it is cut into two symmitrical parts by a plane containing the principal axis and then two pieces are joined. the power of combination will be ?

Equi-convex lens is a convex lens whose surfaces are of the same radii of curvature.Now when such lens is cut into two symmetrical parts by a plane containing the principal axis and then joined,the focal length of the combination will be infinity,and thus the power of combination becomes zero.