In what type of lens does light converge to a point?

A convex lens is designed to converge light rays to a single focal point. This characteristic is due to its shape, which is thicker in the center than at the edges. When parallel light rays pass through a convex lens, they bend toward the optical axis and meet at the focal point on the other side of the lens.

The optical principles involved can be explained using Snell's law, which governs the bending of light as it passes through different media at various angles. The curvature of a convex lens causes incoming light to refract inward, effectively focusing the rays. This property makes convex lenses essential in various optical devices, such as cameras, glasses for farsightedness, and projectors.

In contrast, a concave lens diverges light rays, leading them away from a focal point; hence, it cannot converge light. The spherical lens and cylindrical lens options are more general terms that do not specifically define the convergence or divergence of light in relation to a point.