4 L = m λ where m = some positive integer . For destructive interference (which is obtained for λ′ = 4196 nm) we require 4 L = k 2 λ′ where k = some positive odd integer . Equating these two equations (since their left-hand sides are equal) and rearranging, we obtain k = 2 m λ λ′ = 2 m 620 496 = 2.5 m . We note that this condition is satisfied for k = 5 and m = 2. It is satisfied for some larger values, too, but – recalling that we want the least possible value for
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