Light
A source of light can have many colors mixed and in different amounts (intensities). A rainbow, or prism, sends the different frequencies in different directions, making them individually visible at different angles. A graph of the intensity plotted against the frequency (showing the amount of each color) is the frequency spectrum of the light. When all the visible frequencies are present in equal amounts, the perceived color of the light is white, and the spectrum is a flat line. Therefore, flat-line spectrums in general are often referred to as white, whether they represent light or something else
Read more about this topic: Frequency Spectrum
Famous quotes containing the word light:
“The light struggled in through windows of oiled paper, but they read the word of God by it.”
—Ralph Waldo Emerson (1803–1882)
“There are only two forces that can carry light to all the corners of the globe ... the sun in the heavens and the Associated Press down here.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)
“Oh! for a closer walk with God,
A calm and heav’nly frame;
A light to shine upon the road
That leads me to the Lamb!”
—William Cowper (1731–1800)