What happens to light rays that are parallel to the optical axis when they pass through a convex lens?

When light rays that are parallel to the optical axis pass through a convex lens, they undergo refraction due to the lens material. A convex lens is designed to converge light rays toward a specific point known as the focal point. As these parallel rays enter the lens, they bend inward (or converge) towards the optical axis due to the curvature of the lens surfaces.

After refraction, all these rays meet at the focal point on the opposite side of the lens. This behavior is a fundamental property of convex lenses and is crucial in many optical applications, such as magnifying glasses and cameras, where focusing light is essential for creating clear images. The focal point is where the light rays effectively concentrate, demonstrating the lens’s ability to manipulate light paths through refraction.