path differenece of light ray to produce first minima

lundi 1 septembre 2014

1. The problem statement, all variables and given/known data

for part a , in order to produce first minima from the central bright ray , the path differenece between 2 ray should be equal to λ/2 or 180 degree am i right? why the notes give the path

differenece = λ

...If path differenece = λ , the two light ray are in phase right? how can destructive intefrence occur?

2. Relevant equations







3. The attempt at a solution




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