ch36-p040 - 40. (a) In a manner similar to that discussed...

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40. (a) In a manner similar to that discussed in Sample Problem 36-5, we find the ratio should be d / a = 4. Our reasoning is, briefly, as follows: we let the location of the fourth bright fringe coincide with the first minimum of diffraction pattern, and then set sin θ = 4 λ / d = λ / a (so d = 4 a ). (b) Any bright fringe which happens to be at the same location with a diffraction
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