In the calculation of bent rays (Sect. 2.2.2) or the massive string above, show that the quantity
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In the calculation of bent rays (Sect. 2.2.2) or the massive string above, show that the quantity Г(z) = r/√1 + ˙r (z)2 is constant along the path (or string). From that observation, deduce the solution of the problem.
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