Intensity

• I=I0 (sin(?/2)/(?/2))2 (cos(?/2)2

• diffraction and interference

• ? = ka sin(?) ?= kd sin(?)

• limit a => 0 I =I0 (cos(?/2))2 Young’s slits

• limit d =ɬ I=I0 (sin(?/2)/(?/2))2 Single slit

• note: ?/? = a/d

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