99. (a) Use of Eq. 36-25 for the limit-wavelengths (λ1= 700 nm and λ2= 550 nm) leads to the condition mm12λλ≥for m1+ 1 = m2(the low end of a high-order spectrum is what is overlapping with the high end of the next-lower-order spectrum). Assuming equality in the above equation, we can solve for “m1” (realizing it might not be an integer) and obtain m1≈4 where we have rounded up. It is the fourth order spectrum that is the lowest-order spectrum to overlap with the next higher spectrum.
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