How is a rainbow formed?

Answer

A rainbow it formed when the sun's rays are bent and reflected off of rain. It's arch is actually just a part of a complete circle but our eyes only see the arch because the light from the sun is refracted by droplets at approximately a 42 degree angle. This angle is so large that the rainbow itself appears at the middle point and opposite of the sun.
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1 Additional Answer
Ask.com Answer for: how is a rainbow formed
Rainbows form when sunlight is refracted into separate colors by water droplets. We usually see rainbows as arcs due to each individual color refracting at different angles.
Though a rainbow spans a continuous spectrum of colors, the human eye usually perceives bands of seven distinct colors: red, orange, yellow, green, blue, indigo and violet.
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