Visible Light Beams
From the side, a beam of light is only visible if part of the light is scattered by objects: tiny particles like dust, water droplets (mist, fog, rain), hail, snow, or smoke, or larger objects such as birds. If there are many objects in the light path, then it appears as a continuous beam, but if there are only a few objects, then the light is visible as a few individual bright points. In any case, this scattering of light from a beam, and the resultant visibility of a light beam from the side, is known as the Tyndall effect.
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Famous quotes containing the words visible, light and/or beams:
“We all agree now—by “we” I mean intelligent people under sixty—that a work of art is like a rose. A rose is not beautiful because it is like something else. Neither is a work of art. Roses and works of art are beautiful in themselves. Unluckily, the matter does not end there: a rose is the visible result of an infinitude of complicated goings on in the bosom of the earth and in the air above, and similarly a work of art is the product of strange activities in the human mind.”
—Clive Bell (1881–1962)
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—Margaret Anderson (1886–1973)
“When Gabriel’s trumpet ends all life’s delay,
Will crash the beams of firmamental woe:
Not nature will sustain the even crime
Of death, though death sustains all nature, so.”
—Allen Tate (1899–1979)