Two Source Interference

Two source interference

constructive interference -------destructive interference -------



Path difference =S2P – S1P

S1 S2

P

= 1 wavelength=



Path difference for constructive interference =

0

2

3

n

(where n is an integer)



½1½

2½

Path difference for destructive interference = (n + ½)

(where n is an integer)

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The path difference is

• (n + ½) for destructive interference

• n for constructive interference

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Two Source Interference

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