Optics/Lenses

Holding a magnifying glass against a wall at the proper distance usually will provide a picture of the lit-up parts of the room. Note that that distance varies, depending on the distance of the object concerned from the lens. Objects that are far away will require a distance called the focal length, while objects that are closer to the lens require a longer distance for a sharp picture of that object on the wall. Eye glasses restore proper sight to very many people, also eyepieces of optical instruments include lenses. Photography has many uses See also wikipedia: List of many optics topics Refraction at a spherical interface See also wikipedia:Refraction A lens Locating the image See also Photography Basics of the Camera wikipedia:Camera The lensmaker’s equation See also Optical Instruments wikipedia:Lens wikipedia:Photographic lens Converging and diverging lenses See also wikipedia:Convex lens wikipedia:Concave lens See also Physics Study Guide/Optics Waves/Geometrical Problems wikipedia: Lenses wikipedia:Optical devices