Why is the sky blue?
The light we get from Sun during day is a mixure of 7 colours namely violet. indigo, blue, green, yellow, orange and red. A clear cloudless day time sky is blue because molecules in the air scatter blue light from the Sun more than red light.
But when we look towards the Sun at sunset, we see red and orange colours because blue light has been scattered out and away from the line of sight. The colour red is having greater wavelength compared to violet. The retina of human eye responds most strongly to red, green and blue wavelenghs. Thus, in traffic signals also we use red and green signals for stop and start.
The light we get from Sun during day is a mixure of 7 colours namely violet. indigo, blue, green, yellow, orange and red. A clear cloudless day time sky is blue because molecules in the air scatter blue light from the Sun more than red light.
But when we look towards the Sun at sunset, we see red and orange colours because blue light has been scattered out and away from the line of sight. The colour red is having greater wavelength compared to violet. The retina of human eye responds most strongly to red, green and blue wavelenghs. Thus, in traffic signals also we use red and green signals for stop and start.
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