Hello guys I have a question about constructive/ destructive interference.(adsbygoogle = window.adsbygoogle || []).push({});

I know that in single slit and double slit patterns that the

dark fringes=destructive interference (minima)

bright fringes = constructive interference (maxima)

I do know that the formula's are as follows:

Single slit:

constructive: path differene= mlambda

(a)sin(theta)= m lambda where m=1,2,3,4 etc...

destructive: path difference= 1/2(m) (lambda)

(a) sin (theta)= (m)lambda where m= 1,3,5,7 etc...

double slit:

constructive interfernce: path differene= mlambda

(d)sin(theta)= m lambda where m=1,2,3,4 etc...

destructive: path difference= 1/2(m) (lambda)

(d) sin (theta)= (m)lambda where m= 1,3,5,7 etc...

So yes I would like you guys to tell me if these formula's are right.... i have been looking in my notes and it really isn't clear.

One last thing... how do you know if you have a constructive pattern or a destructive pattern just by looking at the quesition (if it doesn't tell you to find minima or maxima).

Thank you

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# Constructive and Destructive interference

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