Photography is the technique of producing permanent images on sensitized surfaces by means of the photochemical action of light or other forms of radiant energy. So basically, when you click the shutter, you have frozen a moment in time by recording the visible light reflected from the objects in the camera's field of view. In order to do that, the reflected light causes a chemical change to the photographic film inside the camera. The chemical record is very stable, and can be subsequently developed, amplified and modified to produce a representation of that moment. You can put it in your photo album or your wallet, or it can be reproduced millions of times in magazines, books and newspapers. Today, photography plays a very important role in society as a source of information, a tool in science and technology, as a form of art and as a hobby. It takes a key part in business and industry; used in advertising, documentation, photojournalism and many other ways. Photography has been around for hundreds of years. The term camera, as well as the device itself, comes from the Latin camera “obscura,” meaning “dark room” or “dark chamber.” Original camera “obscurae” were darkened rooms with a small hole in one wall. Light would enter the room by means of this hole and projected an image from the outside on the opposite of the darkened wall. Although this was a very unclear image, artists used this apparatus to sketch by hand the scenes projected by the “camera.” After about 3 centuries, the camera “obscura” developed into a handheld box with a pinhole in it and an optic lens was added to sharpen the image. Nowadays, technology allows us to take pictures with many different devices and in many different ways....
