What is the primary function of a convex lens?

• A. Diverge light rays
• B. Converge light rays
• C. Reflect light rays
• D. Absorb light rays

Answer: (B)

A convex lens primarily functions to converge light rays. When parallel light rays pass through a convex lens, they are refracted towards a focal point on the opposite side of the lens. This property is due to the shape of the lens, which is thicker in the center and thinner at the edges, causing the light rays to bend inward.

This convergence of light is the reason convex lenses are utilized in various optical devices, including magnifying glasses, cameras, microscopes, and binoculars, where a focus point is essential for image formation. The ability to bring light rays together allows for clearer and more detailed images, making convex lenses vital in applications where clarity and focus are important.

The other choices involve functions that do not align with the behavior of a convex lens, as it does not diverge, reflect, or absorb light in the same manner as the other lenses or materials described.