Power in Optics
In optics, or radiometry, the term power sometimes refers to radiant flux, the average rate of energy transport by electromagnetic radiation, measured in watts. In other contexts, it refers to optical power, the ability of a lens or other optical device to focus light. It is measured in dioptres (inverse metres), and equals the inverse of the focal length of the optical device.
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Famous quotes containing the words power in and/or power:
“Democracy shows not only its power in reforming governments, but in regenerating a race of men—and this is the greatest blessing of free governments.”
—Andrew Jackson (1767–1845)
“I only wish that ordinary people had an unlimited capacity for doing harm; then they might have an unlimited power for doing good.”
—Socrates (469–399 B.C.)