Saturday, November 14, 2009

Why the sky look blue although violet has an even smaller wavelength than blue ?

since blue light has a smaller wavelength than red, it is scattered more than red and hence the sky looks blue. but violet has an even smaller wavelength than blue. then why does not the sky look violet

Why the sky look blue although violet has an even smaller wavelength than blue ?
Because oxygen molecules scatter blue light and NOT violet





A simple way to describe what happens would be to say that the air molecules, which are about 0.0004 millimeters in diameter, are very close in size to the waves of blue light. Other colours have bigger or smaller waves, and mostly pass right through, but the blue light waves hit the air molecules and scatter in all directions. As the sunlight comes down through the atmosphere, the blue light in it gets scattered all over the place. Some of this scattered light (there's a lot of it) reaches our eyes, making the sky seem blue. The sunlight that's left that finally reaches the ground has lost most of its blue light, leaving it yellowish in colour, so the sun itself appears yellow.
Reply:I believe it is because violet bends too much and so is not scattered in as wide a range as blue.
Reply:The eye is relatively insensitive to violet light but more sensitive to green light than the shorter wavelengths. Although there may be relatively more violet in the mix, the fact that there is also lots of green counteracts the tendency of the scattered light's hue toward violet.


No comments:

Post a Comment