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Why is the sky blue?

Cloudless daylight sky is blue because molecules in the air scatter blue light more than red light

The bright, cloudless daylight sky is blue because molecules in the air scatter blue light more than red light. When we gaze up at the sun at sunset, we see red and orange hues because blue light has been spread out and away from our line of sight. The sun’s white light is a composite of all the shades of the rainbow. Isaac Newton proved it by using a prism to separate the different colors and so generate a spectrum. The wavelengths of light are what distinguishes them as colors.

The visible section of the range extends from red light at approximately 720 nm to violet at around 380 nm, with orange, yellow, green, blue, and indigo in between. The human eye’s retina has three types of color receptors that respond most strongly to red, green, and blue wavelengths, providing humans with color vision. John Tyndall took the first steps toward accurately understanding the color of the sky in 1859.

When light passes through a clear fluid containing microscopic particles floating in it, he discovered that this more precise blue wavelength is scattered more strongly than the longer red wavelengths. The blue light it scatters may be seen. However, the light seen directly from the end is reddish after passing through the tank. The dispersed light may also be demonstrated to be polarised by employing a polarised light filter, much as the sky looks a deeper blue when viewed through polarized sunglasses.

Sunlight enters the Earth’s atmosphere and is dispersed in all directions by the gases and particles in the atmosphere. Because blue light travels in shorter, smaller waves than the other hues, it is scattered more. This is why we see blue skies the majority of the time.

This article is curated by Prittle Prattle News.

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