What type of lens is thicker in the middle and can converge light rays?

• A. Concave lens
• B. Convex lens
• C. Cylindrical lens
• D. Flat lens

Answer: (B)

A lens that is thicker in the middle and can converge light rays is known as a convex lens. The shape of a convex lens allows it to cause parallel light rays that pass through it to bend towards the center, or converge. This property is utilized in various optical devices, such as magnifying glasses and cameras, where the goal is to focus light in a specific way to form images.

Convex lenses are typically used in applications where light needs to be collected and focused, demonstrating their important role in optics. Their ability to converge light is a fundamental characteristic that distinguishes them from other types of lenses, which may either diverge light or have different focuses and functions. This understanding is crucial for effectively using lenses in practical applications such as corrective eyewear, projectors, and photography.