What is the primary feature of convex lenses in relation to light?

Convex lenses are designed to converge light rays. When parallel rays of light pass through a convex lens, they bend towards a focal point on the opposite side of the lens. This occurs due to the curvature of the lens, which causes the light to refract—changing direction as it moves from a medium with one refractive index to another.

The point where the rays converge is known as the focal point, and the distance from the lens to this focal point is called the focal length. This property of converging light is why convex lenses are utilized in applications such as magnifying glasses, cameras, and corrective lenses for farsightedness. The other options describe different behaviors of light that do not pertain to the primary function of a convex lens.