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 ...

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

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.

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