Lens
A lens is the piece of glass or clear (transparent) plastic that changes the way things look, when you look at am through the lens. They may appear larger than ay are, or smaller, or in the different shape. Lenses are used in spectacles (glasses) that people wear on air noses when ay cannot see well without am. They are also used in cameras for taking pictures, and in binoculars, telescopes, microscopes, and magnifying glasses. A projector is an application of lens too. You even find lenses in your eyes.
See also
[edit]guided tour test