why is the colour of the sky blue?
why is the sky blue why not red or purple ? And what makes the grass green ?
1. The color of the sky is blue because the atmosphere scatters shorter wavelenght light (blue and violet) more than longer wavelength light (red), and thus we see more of the scattered blue light.
For more,
http://en.wikipedia.org/wiki/Diffuse_sky_radiation
2. Grass is green because all green plants contain chlorophyll. Chlorophyll is a pigment found in green plants that absorbs best at around 700nm (red color) and poorly at around 500nm (green). Hence, it reflects green light most, and that is why we see plants as green.
http://en.wikipedia.org/wiki/Chlorophyll
Peter Gabriel – Sky Blue
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