Save guides, add subjects and pick up where you left off with your BBC account. The centre of the lens is called the optical centre C. In a ray diagram, a converging lens is drawn as a vertical ...

Lenses can either be convex/ converging or concave/ diverging. Convex lenses take parallel light rays from distant objects and bend them to converge at a single point known as the focal point.

These lenses are either convex - converging light, which magnifies an object, or concave, where light diverges making an object smaller. However, this new lens is 40 nm thin on a flat glass surface.

A Convex Lens is a lens that is thicker at the center and thinner at the edges. The center is presented as a bulged outward circle with edges thinning towards the end. It is called a converging ...

A double convex lens/mirror is a converging lens. A double concave lens/mirror is also symmetrical across both its horizontal and vertical axis. The two faces of a double concave lens can be thought ...

We compare and contrast concave and convex lenses by drawing ray diagrams. In this Closer Look segment on Lenses, we compare and contrast concave and convex lenses by drawing ray diagrams and ...

The near-point of hypermetropic eye is more than 25 centimetres away. It can be corrected by using spectacles containing convex lenses because in will increase the converging power of the eye-lens.