# Magnification values and signs produced by a Lens & their implication | Lens Magnification rules

Let’s see what the value and sign of the magnification of a lens tell us about the type of lens and image formed.

1) If the magnification ‘m’ has a positive value, the image is virtual and erect. And if the magnification ‘m’ has a negative value, the image will real and inverted.

2) A convex lens can form virtual images as well as real images, therefore, the magnification produced by a convex lens can be either positive or negative.

3) A convex can form images which are smaller than the object, equal to the object, or bigger than the object, therefore magnification ‘m’ produced by a convex lens can be less than 1, equal to 1, or more than 1.

4) A concave lens, however, forms only virtual images, so the magnification produced by a concave lens is always positive.

5) A concave lens forms images that are always smaller than the object, so the magnification ‘m’ produced by a concave lens is always less than 1.

**Related Posts you can refer to understand the rules of magnification by spherical lenses.**

sign convention for spherical lenses

what is magnification in context with a lens?

ray diagrams of convex and concave lenses

convex lens – rules of the images formed