A convex lens is called a converging lens because of its shape and how it affects light rays passing through it.

• Shape: A convex lens is thicker in the middle and thinner at the edges.
• Refraction: When parallel light rays pass through a convex lens, they are refracted (bent) towards the normal (an imaginary line perpendicular to the surface of the lens). Due to the lens's curved shape, the light rays are bent inwards.
• Convergence: This bending of light rays causes them to converge or meet at a single point on the opposite side of the lens. This point is called the focal point.

Therefore, because a convex lens causes parallel light rays to come together or converge at a point, it is aptly named a converging lens.