Q. A concave lens always forms an image which is
Answer: virtual and erect
Notes: Concave lens possesses at least one surface that curves inwards. It is a diverging lens as it diverges the light rays that are incident parallel to it concave surface. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia). After light rays have passed through the lens, they appear to come from a point called the principal focus. The image formed by a concave lens is virtual, upright, and smaller than the object, and being virtual cannot be projected onto a screen.