Tech & Science: How is a rainbow formed? - PressFrom - United Kingdom
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Tech & ScienceHow is a rainbow formed?

19:40  12 january  2019
19:40  12 january  2019 Source:   popsci.com

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How is a rainbow formed? © Deposit Photos rainbow in a field If you’ve ever seen one, consider yourself lucky. For a rainbow to appear, the conditions must be just right.

Because of their colorful and unique display, rainbows have generated countless legends and myths throughout history. Among the most popular is the Irish folklore that leprechauns store their pot of gold at the end of a rainbow. But the truth is, rainbows can be seen only if you are in the right place at the right time.

If you’ve ever seen one, consider yourself lucky. For a rainbow to appear, the conditions must be just right.

Rainbows can be seen when light passes through raindrops, says Kristin Calhoun, a research scientist at the National Oceanic & Atmospheric Administration (NOAA), the scientific agency focusing in part on the conditions of weather.

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When a person sees a rainbow, it’s really an optical illusion created by the refraction and reflection of light. An optical illusion is when you see something that appears to be something other than what is really there.

When sunlight passes through raindrops, the light bends, or refracts, as it enters the droplet, and then reflects off the inside of the raindrop. This happens because the water is more dense than the air that surrounds it. As it exits the droplet, the light separates into wavelengths. Visible light is made up of various wavelengths, and each wavelength appears as a different color: red, orange, yellow, green, blue, indigo and violet. Red light, for example, bends at a different angle than violet light.

This is why “the person on the ground sees each color at a different location,” Calhoun says, and why rainbows look like a bow or an arc. Sometimes, however, rainbows can actually form an entire circle that you can see in a plane with the right conditions.

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Irish weather forecast: Temperatures to plummet again tonight ahead of mixed week of wind and rain Sunday will be breezy with some bright spells and scattered showers , but it will remain quite cold. Temperatures will vary between eight and 10 degrees in cool and gusty northwest winds, which will get strong at times along the west coast. A Met Eireann forecaster said: "Cool and breezy with brigh . "Maximum temperatures eight to 10 degrees with moderate to fresh and occasionally gusty northwest to west winds but strong at times along Atlantic coasts. Winds decreasing light to moderate this evening.

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How is a rainbow formed ? Update Cancel. aHd by Quora for Business. This happens EVERYWHERE when there is rain! There is never "one" rainbow - you just need to be in a specific place for the light to hit your eyes.

Because rainbows are created by light via raindrops, the best time to catch a rainbow is when it’s sunny and raining. “There is an even better chance when the sun is at a lower angle, so early or later in the day,” Calhoun says.

If you’re trying to spot one, the key is to face the rain and have your back to the sun.

With the conditions just right, Hawaii gets lots of rainbows. “Small showers and storms often form in late afternoon due to the combined effects of topography and daytime heating of the land,” Calhoun says. “These types [of] showers often produce heavy rain, but remain isolated over the center of the island.”

Because rainbows are optical illusions, they’re not located at a specific distance. The location is relative to the person. That means there’s no chance you’ll ever find that pot of gold.

Irish weather forecast: Met Eireann says 'very mild' weekend in store as temperatures set to hit 15C.
The warm weather will start today and continue for the rest of the week

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