The given lens is broken into four parts rearranged as shown. If the initial focal length is f, then after rearrangement the equivalent focal length is

The given equi-convex lens is broken into four parts and rearranged as shwon. If the initial focal length is f, then after rearrangement the equivalent focal length is

The given equi-convex lens is broken into four parts and rearranged as shwon. If the initial focal length is f, then after rearrangement the equivalent focal length is

If f is focal length of the lens, then the power of a lens is equal to

In a Huygen's eye-piece the eye lens has a focal length of f, the equivalent focal length of eye-piece is

A convex lens is in contact with a concave lens. The magnitude of the ration of their focal lengths is 2//3 . Their equivalent focal length is 30cm. What are their individual focal lengths?