Asked by
RAHUL chauha
in
Miscellaneous
at
9:48 AM on January 29, 2009
SUKUMARAN's Answer
Our earth is surrounded by a blanket of air,which is called the atmosphere.It is mainly composed of Nitrogen,Oxygen,Carbondioxide,dust particles,water vapour and other gases.The light that comes to us from sun has to travel through this atmosphere.
The Sun is the main source of light for us.When the sunlight enters the atmosphere,it falls upon the dust particles,water and air molecules.These molecules scatter the sunlight in all the directions.That is why,there is light all around after the sunrise.
We know that the sunlight is a mixture of seven colours;Violet,Indigo,Blue,Green,Ye llow,Orange and Red.When the Sunrays collide with the air molecules,the Violet,Indigo and Blue colours are scattered most and Red is scattered least.Therefore,when we look at the sky the light that enters in our eyes mainly consists of Violet,Indogo and Blue colours.The mixcture of these three colours is almost Blue.THAT IS WHY THE SKY APPEARS BLUE.
If the Earth had no atmosphere ,the sky would have just appeared Dark..This fact becomes very clear when we look at the sky from the surface of the Moon.It appears dark since there is no atmosphere at the Moon.Similarly,the sky appears dark when we look from a spacecraft,because there are no scattering particles in the space.
Answered at
8:52 PM on January 29, 2009
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