Question

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. The focal length of each part is?

Answer 1

when cut perpendicularly focal length remains same

and when we will cut it parallel to axis focal length will be f/2

therefore focal length of each part will be f/2

Answer 2

Answer:

when cut perpendicularly focal length remains same

and when we will cut it parallel to axis focal length will be f/2

therefore focal length of each part will be f/2

Explanation: