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QUESTION
//d2vlcm61l7u1fs.cloudfront.net/media%2F505%2F50528146-4b95-4309-8ce1-32c8c243f432%2Fphp80ZkH3.
http://d2vlcm61l7u1fs.cloudfront.net/media%2F505%2F50528146-4b95-4309-8ce1-32c8c243f432%2Fphp80ZkH3.png
Answer is Red would be seen at A and blue would be seen at B
because blue is easily scatterable by air than red and last two options don't match and there is some light is region B
**BUT I WANT TO KNOW THAT What colors go in the boxes (a) and (b)?**
