What can a convex lens be used for?

A convex lens is designed to converge light rays that pass through it, which allows it to magnify images. When parallel rays of light enter a convex lens, they are refracted toward a common point called the focal point. When an object is placed closer to the lens than the focal point, the image formed is larger than the object and can appear upright, making the lens useful for magnification purposes. This principle is utilized in devices like magnifying glasses and microscopes, where enhanced visibility of small details is essential.

The ability to magnify images through a convex lens arises from its shape—thicker in the middle than at the edges—which allows it to bend and focus light effectively. This focusing capability is what differentiates it from other types of lenses, like concave lenses, which diverge light rather than converge it.