Why can a rainbow appear opposite the Sun after rain?

A) A long atmospheric path scatters away much short-wavelength light

B) Earth's shadow on the Moon can be seen from Earth's night side

C) Raindrops refract and reflect sunlight by color

D) A smooth surface gives orderly specular reflection

Answer: C

Explanation: Raindrops refract and reflect sunlight by color explains this observation. The observer's position sets the visible arc.

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