Asked by pvandana | 8th Jul, 2008, 09:04: PM

Expert Answer:

When we draw a circle with a compass, we keep the angle between the two legs constant.
A ray from the top most point on the rainbow to our eye makes an angle to the horizontal direction. Theory says this angle is a constant.Imagine the ray as one leg of long compass and the horizontal direction as another leg which points the center. Keeping the angle constant when the compass is rotated an arc is formed. If we go high up we might can see the whole circle.

Answered by  | 9th Jul, 2008, 11:22: AM

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