Question

what is concave lens​

Answer 1

Answer:

A lens having two spheric surfaces curved inward is called ckncave lens.

power of lens=1Diopter whose focal length is 1m${ }^{ - 2}$

Answer 2

A concave lens is a type of lens that diverges a straight light beam coming from the source to a diminished, upright, virtual image is known as a concave lens. It can form both real and virtual images. Concave lenses have at least one surface curved inside. Concave Lenses Are for the Nearsighted, Convex for the Farsighted. Concave lenses are used in eyeglasses that correct nearsightedness.