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path difference

d

=

r

2

-

r

1

sin

q

=

d

d

Þ

d

=

dsin

q

=

r

2

-

r

1

r

1

approx. parallel r

2

as L

>>

d

We get constructive interference when

d

=

dsin

q

=

m

l

,

m

=

0

,

±

1

,

±

2

,

K

We get destructive interference when

d

=

dsin

q

=

m

+

1

2

æ

è

ç

ö

ø

÷

l

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