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 word power:
“The wise man should withdraw his soul within, out of the crowd, and keep it in freedom and power to judge things freely; but as for externals, he should wholly follow the accepted fashions and forms.”
—Michel de Montaigne (1533–1592)