Intensity of single slit and double slit

gsingh2011
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After looking at the graphs of single slit and double slit interference of intensity vs. angle, it seems that the intensity drops off very steeply with single slit interference but doesn't drop off at all with double slit interference patterns. Why is that?
 
on Phys.org
The intensity will go up and down as it drops off, but it does drop off for both.
 

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