Why can I see tiny rain­bows in drops of wa­ter?

Science Illustrated - - ASK US -

Ra­dio waves, mi­crowaves, in­frared light, ul­tra­vi­o­let ra­di­a­tion, X-rays, and gamma rays are elec­tro­mag­netic (EM) ra­di­a­tion, which con­sists of pho­tons just like vis­i­ble light. In a vacuum, all types of elec­tro­mag­netic ra­di­a­tion move at a speed of about 300,000 km/sec­ond (the speed of light), but at dif­fer­ent wave­lengths. When EM ra­di­a­tion goes from air to wa­ter, the change will slow down some wave­lengths. The shorter the wave­length, the more slow­down. When sun­light hits a drop of wa­ter, dif­fer­ent wave­lengths are slowed down and bent dif­fer­ently to pro­duce a rain­bow ef­fect.

Rain­bows are pro­duced be­cause blue light is slowed down more in wa­ter than red light.

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