https://www.vedantu.com/question-answer/a-double-convex-lens-of-focal-length-f-is-cut-class-12-physics-cbse-5f8de3349ccacc15b1f50310
A double convex lens of focal length f is cut into 4 equivalent parts One cut is perpendicular to the axis and the other is parallel to the axis of the lens...
double convex lensfocal lengthcut