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The terminology used to describe the action of bringing a bundle of light rays together is "converge." When light rays converge, they are directed towards a single point or a focal point, which typically occurs with the use of converging lenses or mirrors. This property is fundamental in optics, particularly in devices such as cameras, microscopes, and other optical instruments where focusing light is essential for forming clear images.

In contrast, concepts like "diverge" refer to light rays spreading out from a point, whereas "refraction" involves the bending of light when it passes from one medium to another, changing its speed. "Diffuse" pertains to light scattering in many directions and is not associated with the process of bringing light rays together. Understanding the concept of convergence is crucial for various applications in ophthalmology and optometry, as it relates to how images are formed on the retina.