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Q.

The sky's blue colour is caused by the following factors:

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a

blue is the natural colour of sky.

b

red light is absorbed.

c

Red light is preferentially scattered.

d

blue light is preferentially scattered.

answer is B.

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Detailed Solution

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Sunlight enters the Earth's atmosphere and is dispersed in all directions by the gases and particles in the atmosphere. Because blue light travels in shorter, smaller waves than the other colours, it is scattered more. This is why we usually see observe the sky as blue.

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