. What do you mean by Cutting of Lenses

Best Answer

When an equiconvex / equiconcave lens is cut transversely into two equal parts, the focal length of each part is double as that uncut lens. The reason is that the radius of curvature of none of the surfaces has changed. The principal axis of each half is the same as the original lens.

When a lens is cut into two equal halves parallel to the principal axis, the focal length of each part changes. If the radii of curvature are equal in the original lens, then the focal length doubles.


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