State two differences between a convex and a concave lens.

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Concave lens	Convex lens
(i) It is a type of lens which is thinner in the middle and thicker at the edges.	(i) It is a type of lens which is thicker in the middle and thinner at the edges.
(ii) It diverges (bends outward) the light and is called a diverging lens.	(ii) It converges (bends inward) the light generally falling on it. Therefore, it is called a converging lens.
(iii) The image formed by a concave lens is always virtual, erect and smaller in size than the object.	(iii) A convex lens can produce a real or virtual, inverted or erect, diminished, same-sized, or enlarged image of the object, depending upon the position of the object.