The Light Theory
Light is the photographer’s medium, and a photograph is the image of a pattern of light recorded on film. The word photography means writing or drawing with light. Without light there could be no vision or photography because it is light reflected from the world a round us that makes things visible to both our eyes and the eye of the camera. The nature of light has a critical effect on the pictures you make. Few photographers actually understand much about light. But they are no one. Scientists have never been able to agree fully about the nature of light. However, certain useful thing clear and well understood about how light behaves.Light is a form of electromagnetic radiant energy to which the eye is sensitive. It travels at tremendous speed from its source, such as the sun, a fluorescent lamp, an electronic flash, or whatever source is used. It has an effect on the materials it falls on, skin becomes tanned,and fruit is ripened by the light of the sun. Depending on the way in which light is received or rejected, a complex pattern of light, shade, and color results.Other types of radiant energy, such as radio waves and X rays, are similar to light but the eye cannot see them. Thus they are not light. By definition, light is magnetic energy visible to the human eye. All other electromagnetic energy is invisible, therefore, is not considered light. Ultraviolet and infrared radiation two such invisible radiations that are of concern to the photography.