ch35-p077 - 77. We solve for m using the formula r = b2m +...

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77. We solve for m using the formula rm R =+ 21 b g λ2 obtained in Problem 35-75 and find m = r 2 / R λ – 1/2. Now, when m is changed to m + 20, r becomes r' , so m + 20 = r' 2 / R λ – 1/2. Taking the difference between the two equations above, we eliminate
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