Why Do Rainbows Curve?

Answer

A rainbow is usually formed when raindrops are hit by light rays from the sun. According to Descartes (1637), rainbows appear curved because the rays from the sun hit the raindrops at an angle of approximately 138 degrees hence giving them the curved shape.
1 Additional Answer
Ask.com Answer for: why do rainbows curve
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.
Q&A Related to "Why Do Rainbows Curve"
Rainbows are not always curved. However, they usually appear to be that way because light bends as it reflects off of one surface to another. However, rainbows can appear to be straight
http://answers.ask.com/Science/Physics/why_are_rai...
Its because the rainbow is actually a circle. You only see the segment that goes from horizon to horizon. Sometimes you can see the whole rainbow, even multiple ones around the sun
http://wiki.answers.com/Q/Why_do_rainbows_curve
The reason why the rainbow is curved is because all the angles in t...
http://www.chacha.com/question/why-is-a-rainbow-cu...
Because of the heavy pots of gold at each end. Grahame Marr, Kingscliff Like a few shady characters around, they'd be less colourful if they went straight. Randolph Magri-Overend,
http://www.smh.com.au/news/big-questions/why-are-r...
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