Question

what is concave lens​

Answer 1

Answer:

A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia).

Answer 2

Answer:

the lense which is thick at the boundary and thin at the middle is called a concave lense I think you are in class 7