Magnifying glasses work because they have a curved lens which bends the light between a viewer and an object. The degree to which the light is bent, referred to as the optical power, directly affects the strength of magnification. The magnification power therefore has a direct relation to the curvature of the lens and an indirect relation to its size. If you are unsure of the strength of your magnifying glass, with a few quick measurements and calculations you can figure it out. Tips
