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:
“O God, protect me from my friends, that they have not power over me.
Thou hast giv’n me power to protect myself from thy bitterest enemies.”
—William Blake (1757–1827)