Question

The upper half of a convex lens is made of one transparent medium while the lower half is made of another medium. Will this affect the focal length of the lens? Explain.

Answer 1

Yes, this will affect the focal length of the lens, and the lens will have two different focal lengths.

According to the Lens Maker's Formula, the focal length (f) of a lens depends on the refractive index (n) of its material:

`1/f = (n - 1) (1/R_1 - 1/R_2)`