Much of what we know about the universe at large has come to us in the form of light—from stars, planets, galaxies, and other collections of luminous and illuminated matter. Light is just a small portion of a continuous spectrum of electromagnetic radiation—a portion to which our eyes happen to be sensitive and which our brains can distinguish as separate colors. Electromagnetic radiation is emitted by matter. Later we shall see in some detail how that comes about.
KeywordsPrincipal Axis Focal Point Focal Length Small Object Real Image
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