Interference pattern intensity

[Sheldon11]

why the intensity is the most in the center in interference pattern?

 

[jerromyjon]

Because that is where the constructive interference has the most probability of occurring.

 

[Gigaz]

For a simple double slit with slit width almost zero, all the maxima should have the same intensity. So the question is justified. However for a single slit with a certain width, the intensity is highest in the centre. And for a double slit with slit width>0, you will get an interference pattern that has the most intensity in the center maximas. This is rarely discussed at school level.