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GRAVITATION - ncert.nic.in
by pins. With the tip of a pencil stretch the string taut and then draw a curve by moving the pencil keeping the string taut throughout.(Fig. 8.1(b)) The closed curve you get is called an ellipse. Clearly for any point T on the ellipse, the sum of the distances from F 1 and F 2 is a constant. F 1, F 2 are called the focii. Join the points F 1 ...
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