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The primary function of a converging lens is to focus light rays to a single point. This occurs because a converging lens, which is typically convex in shape, causes parallel light rays that pass through it to bend inward and converge at a focal point. This property allows converging lenses to magnify images and is widely utilized in various optical devices, such as cameras, microscopes, and the human eye.

When light rays from a distant object enter the lens, they converge after passing through, creating a real image at the focal point on the opposite side of the lens. The ability of a converging lens to manipulate light is integral to the design of optical instruments, making the understanding of this mechanism essential for fields that rely on optics.

In contrast, the other choices refer to different optical behaviors. For example, spreading light rays is characteristic of a diverging lens, which has the opposite effect, causing light rays to spread apart rather than focus. Reflecting light rays is a function associated with mirrors, not lenses. Filtering specific wavelengths involves the selective transmission of light, typically performed by optical filters and not directly related to the focusing characteristic of converging lenses.