White light or sunlight is mixture of all the seven colours
(violet, indigo, blue, green, yellow ,orange and red) . when light suffers
reflection or bending in a medium , al these colours is called a spectrum.
Rainbow is a great curved spectrum, which is caused by the break up of light that
passes through raindrops. A rainbow is seen only during cloudy season when
there is sunshine also.
To experience a rainbow , one has to be in the middle, the
sun behind him and the cloud in front. They can be seen only in the early
mornings or late afternoons.
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