Intensity Maxima

• I = I0 [sin(?/2)/(?/2)]2

• ?=0 is a maximum I/I0 =1

• first secondary maximum is near (?/2) ~ 3?/2 => I/I0 = (-1/(3?/2 ))2 =4/9?2 =.045 => 4.5%

• second secondary maximum near (?/2) ~ 5?/2 => I/I0 = (+1/(5?/2 ))2 =4/25?2 =.016 => 1.6%

• ?/2= ?sin?(a/?) => sin?=(?/a)(?/2?)

• first secondary maximum moves inward as a/? increases ( as ? decreases or a increases)

?/2~ (m+ 1/2)? , m=1,2,3

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