A convex lens, also known as a converging lens or positive lens, has some intriguing properties:

1. Shape and Refraction:

   • A convex lens is thicker in the middle and thinner at the edges.
   • It is typically made up of two spherical surfaces.
   • When light passes through a convex lens, it converges or comes together, focusing at a point on the other side.

2. Focal Length:

   • The distance between the center of the lens and the focus point is called the focal length of the convex lens.
   • If both surfaces are bent outward, it’s called a biconvex lens or simply a convex lens.
   • When one surface is flat and the other is convex, it’s termed a plano-convex lens.

3. Uses of Convex Lenses:

   • Vision Correction: The lens in our eyes is a prime example of a convex lens. It helps us see by focusing light onto the retina.
   • Magnifying Glasses: A magnifying glass uses a convex lens to produce a magnified and upright image of an object placed close to it.
   • Cameras: Convex lenses in cameras focus light, resulting in clear and crisp images.
   • Microscopes and Telescopes: Compound lenses, often including convex lenses, are used in these instruments.
   • Hypermetropia Correction: Convex lenses can correct long-sightedness.
   • Other Optical Devices: They play a crucial role in various optical devices.