Question

What is a rainbow give two necessary conditions the rainbow is formed on the sky

Answer 1

Rainbow is a natural spectrum which appears in the sky after a rain shower it is caused by Dispersion of Sunlight by tiny water droplets present in the atmosphere

The conditions necessary are

1. A rainbow is formed in a direction opposite to the direction of sun

2. There must be observer

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Answer 2

rainbow is a natural disaster which won't affect the earth.

rainbows are formed by:-

                                        1)after rain, the first light rays should fall on the towers

                                        2)the sunlight should pass through a water drop at 45      degrees.

to understand the second condition, you should perform an activity

Activity:-take a waste C.D (or) D.V.D and apply the VIBGYOR colours in the VIBGYOR format and the red colour should be applied one-forth of the C.D darkly. Now spin the c.d by keeping a pencil in the centre of the C.D. now you can understand white light is made up of 7 different colours and 7 colours are used to make the white colour.

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