The field of optics represents another important part of imaging. Optics is the branch of physics that deals with electromagnetic radiation, most commonly visible light. The theoretical and purely scientific facets of this field are called optical science or optical physics, but the application of optics is called optical engineering. Optical engineers use their knowledge of electromagnetic radiation to solve problems and create useful mechanisms. Examples of such devices include lasers, telescopes, microscopes, fiber optic cables, and much more. In order to manipulate electromagnetic radiation optical engineers use lenses. When one thinks of a lens, the image that most commonly comes to mind is a curved piece of clear plastic or glass. While this is indeed the most common type of lens, a lens is any system that refracts or disperses light in a useful or desired manner. Historically the main purpose of creating lenses was for use in telescopes, enabling early astronomers to gaze at the planets and
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