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.
Read more about this topic: Light Beam
Famous quotes containing the words visible, light and/or beams:
“The whole visible universe is but a storehouse of images and signs to which the imagination will give a relative place and value; it is a sort of pasture which the imagination must digest and transform.”
—Charles Baudelaire (1821–1867)
“But thou beneath the sad and heavy line
Of death, doth waste all senseless, cold, and dark;
Where not so much as dreams of light may shine,
Nor any thought of greenness, leaf, or bark.”
—Henry Vaughan (1622–1695)
“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)