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Some times rainbows occur after rain. Why?
Asked by Meenambik Durva...(student) , on 10/8/12

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After rain fall the humidity level of air increases and there is large concentration of tiny droplets of water in the air to refract sunlight. Rainbow forms when sunlight hits the water droplets suspended in the atmosphere and undergo total internal reflection. When the sunlight comes out of the drop it disperses, where the drop acts like a small prism. This is why we see rainbow after rainfall.

Posted by Somnath(MeritNation Expert)on 12/8/12

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Light from the sun appears to be colourless but it is really made up of all seven visible colours (red, orange, yellow, green, blue, indigo and violet). When the "white" sunlight enters a raindrop it breaks up into the various colours (due to a process called refraction) and bounces back out of the drop towards your eyes when it reflects off the rear surface of the raindrop. 
For this to occur the sun has to be shining and you have to be between where the sun is in the sky and the rain or mist droplets are located. You can make your own rainbow with a garden hose set to mist on a sunny day or by using a prism,

Posted by Akanksha Chauha...(student)on 10/8/12

Double rainbow and supernumerary rainbows on the inside of the primary arc. The shadow of the photographer 's head on the bottom marks the centre of the rainbow circle ( antisolar point ).

A rainbow is an  optical  and  meteorologi cal  phenomenon that causes a  spectrum  of  light  to appear in the sky when the Sun shines on droplets of moisture in the  Earth 's atmosphere . It takes the form of a  multicoloured   arc . Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

In a "primary rainbow", the arc shows red on the outer part, and violet on the inner side. This rainbow is caused by light being refracted while entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.

In a double rainbow, a second arc is seen outside the primary arc, and has the order of its colours reversed, red facing toward the other one, in both rainbows. This second rainbow is caused by light reflecting twice inside water droplets.

Posted by Satyam Purohit(student)on 10/8/12

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