quarta-feira, março 30, 2005
"Rainbows are disks of light rather than narrow rings. Millions of raindrops in the sky opposite the sun form rainbows by reflecting sunbeams back to us through a whole range of angles. Each disk brightens sharply towards its edge and is centered on the same point directly opposite the sun. The red disk is largest and violet the smallest. We see rainbow colours where the disk-edges do not quite overlap. Inside the disks, all colors overlap to form white light, which makes the sky inside the rainbow bright. "
Boca por paulo à(s) quarta-feira, março 30, 2005