Why is the sky blue ? आकाश नीला क्यों है?

 Why is the sky blue ?

Sky Blue

Transmitted light (from the sun, light bulbs, fire, etc) is made up of a spectrum of colours. The longest wavelengths of light are on the red end of the spectrum and the shortest wavelengths are on the blue/violet end of the spectrum.

When transmitted light such as sunlight enters our atmosphere it collides with the oxygen and nitrogen atoms. The colour with the shouter wavelength is scattered more by this collision. Because violet and blue are the shortest wavelengths the sky appears to be violet/blue. But because our eyes are more sensitive to blue light than they are to violet light, we perceive the sky as blue.

Our eyes contain thousand of rods and cones, which ate the receptors for light. Whenever one of the 3 Stooges pokes you in the eye you see a giant blue spot. This is because the blue receptors have been activated. Blue is one of the primary colours and thus more easily activated and seen by our eyes.