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:
“When we come down into the distant village, visible from the mountain-top, the nobler inhabitants with whom we peopled it have departed, and left only vermin in its desolate streets. It is the imagination of poets which puts those brave speeches into the mouths of their heroes.”
—Henry David Thoreau (1817–1862)
“The night has a thousand eyes,
And the day but one;
Yet the light of the bright world dies
With the dying sun.”
—Francis William Bourdillon (1852–1921)
“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)