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:
“Oh, London is a man’s town, there’s power in the air;
And Paris is a woman’s town, with flowers in her hair;
And it’s sweet to dream in Venice, and it’s great to study Rome;
But when it comes to living, there is no place like home.”
—Henry Van Dyke (1852–1933)
“The piety of the Hebrew prophets purges their grossness. The circumcision is an example of the power of poetry to raise the low and offensive.”
—Ralph Waldo Emerson (1803–1882)