Learn about and revise lenses, images, magnification and absorption, refraction and transmission of light with GCSE Bitesize Physics.

Lenses are used in cameras, telescopes, binoculars, microscopes and corrective glasses. A lens can be convex or concave .

In convex lens, the image is always formed at a point where at least two refracted light rays meet. Rule 1: A ray of light which is originally parallel to the principal axis passes through the ...

A double-convex lens is compose of two convex surfaces, has a positive focal length. Normally Bi-Convex lenses are most suitable where the object and image are on opposite sides of the lens, and are ...

The properties of concave and convex lenses were first described around the year 1000, although magnifiers in the form of lens-shaped crystals or glass may have been used much earlier.