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:
“Anyone who is kind to man knows the fragmentariness of most men, and wants to arrange a society of power in which men fall naturally into a collective wholeness, since they cannot have an individual wholeness. In this collective wholeness they will be fulfilled. But if they make efforts at individual fulfilment, they must fail for they are by nature fragmentary.”
—D.H. (David Herbert)
“Even voting for the right is doing nothing for it. It is only expressing feebly your desire that it should prevail. A wise man will not leave the right to the mercy of chance, nor wish it to prevail through the power of the majority.”
—Henry David Thoreau (1817–1862)