Why Does Light Bend? | Concave & Convex Lenses | The Dr Binocs Show | Peekaboo Kidz

A lens is a transparent piece of glass or plastic with curved sides that can bend light rays as they pass through it. This bending of light is called refraction.

There are two main types of lenses: convex and concave. Convex lenses are curved outwards, thicker in the middle, and have thinner edges. Concave lenses are curved inwards, have a thin center, and thick edges.

Convex lenses work by refracting light rays, causing them to converge, or meet at a single point called the focal point. Light rays slow down and bend towards the normal line when entering the lens, and bend away from the normal line when exiting, leading to convergence and image projection.

Concave lenses work the opposite way of convex lenses. They cause incident light rays to diverge, meaning they spread away from each other after refraction. This divergence leads to the formation of a virtual image behind the lens at its focal point.

The distance from the center of the lens to the focal point is known as the focal length. The focal length and the distance between the lens and the object determine whether the image formed will be smaller or larger than the original object.