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Rainbow
Rainbow
A rainbow is a coloured arc that stretches across the sky when sunshine hits rain falling from a nearby cloud. The colours in the rainbow split all of the colours present in white light into separate bands. This is called a spectrum.
The rainbow is produced by the way the light is caught by the millions of raindrops in the cloud. Sunlight enters each tiny raindrop and is bounced around inside (a process scientists call refraction). While this is happening, the various colours in the white light become separated, so that when the light finally emerges from the
 Rain gauge – A rain gauge is a funnel that leads down to a measuring cylinder.
raindrop, it is split up into a spectrum of colours.
It is possible to see a number of rainbows at the same time, the lowest one being the brightest and higher ones getting progressively fainter. This is also caused by the way light is changed as it enters raindrops.
Rain gauge
An instrument for measuring rainfall. The design of a rain gauge is important, and each country has its own variation on a standardised shape of rain gauge. All designs have some common
 Rainbow – The complete visible spectrum of colours shows in a rainbow. The inset picture shows a principal rainbow, with further, fainter rainbows outside it. They occur because the raindrops internally refect some light several times before allowing it to escape.
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