An image formed by a lens is erect. Such an image could be formed by a (a) convex lens provided the image is smaller than the object. (b) concave lens provided the image is smaller than the object. (c) concave lens provided the image is larger than the object. (d) concave lens provided the image is of the same size.

Answer: (b) concave lens provided the image is smaller than the object.

A virtual, erect and diminished image of an object is formed by a concave lens. Convex lens forms magnified, erect and virtual images.

Concave lens

The concave lens diverges a straight beam of light and it is thinner at the centre and gets thicker as we move towards the edges.

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