Why the Rainbow is Circular
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-477
2025-12-20
21
Since the raindrop is a sphere, the red rays of the primary bow are sent off in the form of a cone having the drop at its vertex and making an angle of 42° with the axis of the cone. The red ray, therefore, can be seen, from different drops, in any direction that makes an angle of 42° with the axis of the bow, that is, with the line that passes through the sun and the eye of the observer; and hence its form will be circular. In Fig. 1 the sun is supposed to be at the horizon.
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