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A camera is a device designed specially to record images on light sensitive film. There are many different types of cameras but they all work in much same way. The single lens reflex or slr camera shown here a an example of one of the most popular type. When a camera user wishes to take photograph or shot almost exact image that will be recorded on the film can be seen in the view finder. At the right moment shutter is opened by pressing a button known as shutter release.If  the camera is an SLR , the mirror flip up out of the way, allowing the light to pass through  the lens and reach the film. The  lens bends the rays of light so that they produce a sharp image on the film. The amount the light rays have to bent or refracted, depends on how far away the objects are from camera.Refraction is adjusted by rotating the focusing ring on the lens.Some camera use a fixed focus lens that is suitable for photographing  both near and distant objects. Cam...