TYPES OF LENSES
Here are some definitions you will need to know in order to understand how lenses work:
Transparent: material that allows light passes through unhindered.
Refraction : bending of light. as it passes through glass or some material that is transparent.
Focal Point: where the light rays meet as they pass through a lens.
Curvature : how a lens surface is curved and not flat.
Lans : a circle of polished glass any transparent material,most often spherical that can form an image of something in front of it.
Plane: the surface has no curvature.
Parallel rays : rays of light that are equal distance apart and never meet. In a single lens, either one
surface is curved and one is plane, or both surfaces are curved. Light travels through a lens slower than does in the air. This causes somewhere beyond the lens. the light beam to bend and meet Where the light beams meet is called the focal point and the distance from the centre of the lens to the focal point is the focal length. Different rays of light are refracted at different angles as it passes through a lens. Notice that the light ray that passes through the center of the lens does not bend. The rays of light continue in a straight line beyond the focal point to project an image on a screen or photographic paper.
Comments