Why is the sky blue?

Why is the sky blue

Everyone thinks of it at least once in his/her lifetime that why is the sky blue? The answer is the scattering of blue light particles. So let’s discuss it in detail.

Seven colors of white light

Basically, every light colors from the sun scatter in the atmosphere. White light includes the seven different colors which are Red, Orange, Yellow, Green, Blue, Indigo, and Violet. Also, these colors are found in a rainbow. We can observe these seven colors easily from the light experiment with the prism as shown in the figure.

Prism and seven colors
Prism and seven colors


We know that we can see any object only when the light is reflected from that particle and reflected lights comes into our eyes. The same concept was used earlier in Bollywood movie Mr. India. Blue is scattered more than other colors among all the light particles because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.

Closer to the horizon, the sky color is fading to lighter blue or whitish. The sunlight reaching us from low in the sky has passed through even more air than the sunlight reaching us from overhead. As the sunlight has passed through all this air, the air molecules have scattered and rescattered the blue light many times in many directions. And that’s the reason the sky looks blue.

In fact, there is no color of the sky it just appears to blue due to scattering. So we can say blue is the color of nothing in the presence of light and black is the color of everything in the absence of light. To understand the statement of the black being color of the absence of light read the article Why colors are not visible in dim light.

I hope you got an idea of the color of the sky. Do comment below your opinion and question if you have any.

Thank you

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Jaikamal is a very fluctuating mind person who always looks for knowledge or resources of knowledge. He believes that knowledge is the key to success.

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