In Fig., line `AB` represents a lens through which course of rays is as shwon. Is this lens convex or concave ?

How would you identify whether a lens is convex or concave lens.

Concave lens and convex lens

An image I is formed of point object O by a lens whose optic axis is AB as shown in figure. (a) State whether it is a convex lens or concave? (b) Draw a ray diagram to locate the lens and its focus.

What is a lens? Distinguish between a convex lens and a concave lens. Which of the two is a converging lens: convex and lens or concave lens?

When does a convex lens behave as a concave lens ?

When does a convex lens behave as a concave lens ?