Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties.
Why has not man a microscopic eye? For this plain reason, Man is not a Fly. Say, what the use, were finer optics giv'n, T' inspect a mite, not comprehend the heav'n?
Alexander Pope, An Essay on Man (1733-34), Epistle I, line 193.
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