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why doesn`t thunders form in circles or any other shapes?
The rain drops which refract and reflect the sunlight to produce the rainbow should subtend a particular angle at the eye of the observer.According to simple geometricla principles,the rain drops which lie at this particular angle and direction opposite to the sun lie in the form of a full circe or a part of it(arc).Even there are enough rain drops to form a full circle,to an observer on erath,it will look like an arc as it is limited by the horizon.When the sun is near the horizon,an observer on a high mountain may see the whole circle of the rainbow.So, the shape of the rainbow is full circle.What we see is a part of it.The part of a circle cannot be a straight line and it can only be an arc (or semicircle)in shape.Thanks & RegardsRinkoo GuptaAskIITians Faculty
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