Question

a faint shadow the earth appear to be bluish. what is the cause of this effect?

Answer 1

Answer:

This happens because of Rayleigh scattering, the same property that causes the sky to appear blue. The opaque object is able to block the light of the sun, but not the ambient light of the sky which is blue as the atmosphere molecules scatter blue light more effectively. As a result, the shadow appears bluish.

Explanation:

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Answer 2

Answer:

During the daytime, a shadow cast by an opaque object illuminated by sunlight has a bluish tinge. This happens because of Rayleigh scattering, the same property that causes the sky to appear blue. ... As a result, the shadow appears bluish.