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The distance from the slits to the screen equals L. The distance of position P on the screen to the center of the screen equals x<<L and the distance of the slits equals d<<x<<L. We want to determine  1-2.
1
= √ ( L2
+ ( x+d/2 )2 )
and
2
= √ ( L2
+ ( x-d/2 )2 )
In order to evaluate 1-2,
we need to perform two approximations which are explained on the next page.
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