SINGAPORE - Sky gazers around Singapore were dazzled by not one, but two rainbows streaking across the sky on Friday (April 21) morning. Social media users shared their photos which were taken from several places including Changi, East Coast Park, Tanjong Rhu and Woodlands. The Straits Times looks at the science behind the multicoloured natural phenomena and everything else you...
A double rainbow outside Mr Simon Lim's balcony at Neptune Court in Marine Parade, on April 21, 2023.SINGAPORE - Sky gazers around Singapore were dazzled by not one, but two rainbows streaking across the sky on Friday morning.
As light enters the raindrop, it bends in a process called refraction and splits into different wavelengths, which correspond with different colours. Longer wavelengths of light appear red and orange and are bent the least, while shorter wavelengths of light look blue and violet and are bent the most.
Double rainbows occur when light is reflected twice within a raindrop, producing a secondary rainbow above the primary bow. Triple and even quadruple rainbows are possible, depending on how many times refracted light is reflected within a raindrop, according to The Weather Channel. As rainbow watchers move, their view of the sky changes relative to the sun. This means that the colourful curves will either appear to travel with them as they start to see colours reflected from rain in another part of the sky or fade away if there is insufficient rain or sunlight.Iridescent clouds appear because of diffraction, a phenomenon that occurs when tiny water droplets or ice crystals scatter light from the moon or sun.
These nacreous or polar stratospheric clouds develop in frigid air above polar regions and are named after their pastel colours that resemble a mollusc’s hues.
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