What does a convex lens do to light rays regarding focal point?

• A. Converge to a focal point
• B. Diverge away from a focal point
• C. Pass through without changing path
• D. Reflects light

Answer: (A)

A convex lens is a converging lens. It bends parallel light rays so that they come together at a single focal point on the opposite side of the lens. This focusing to one point is what lets a convex lens form sharp images. For example, a ray parallel to the axis refraction causes it to pass through the focal point after the lens. A ray through the center goes straight without bending. The idea that light either diverges, passes through unchanged, or reflects would describe other devices (a diverging lens or a mirror), not a convex lens.