Double-Slit Interference

d = mm
In this simulation, waves in a ripple tank originate from two small slits, shown in red. You may vary the slit separation, d. The resulting interference may be observed in the ripples of the waves that propagate in the tank. Angles at which totally constructive interference occurs are characterized by alternating peak and troughs.  Angles at which totally destructive interference occurs are characterized by an absence of such "ripples". 

How would you determine, quantitatively, the angles at which these interference phenomena occur? 


How does the behavior change as you change the slit separation?

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