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Thursday 27 January 2011

Amazing facts 2

WHY SKY APPEARS IN BLUE DURING DAY AND IN BLACK DURING NIGHT?
Reasons:-
1. You know that sky is covered by clouds.They contain microscopic dust particles and small water particles.When light passes through water and dust particles it gets dispersed(as it has a property of dispersion).water has a property of giving out more blue light.
2.At night there will be no light and there will be no dispersion.So sky appears in black colour

Do you know pilots cannot see blue colur sky as they are top of clouds even during day time

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