PPT Slide
path difference of
l
2
c
phase difference of
p
radians
\
d
l
=
f
2
p
Þ
d
f
=
l
2
p
\
f
=
2
p
l
d
=
2
p
l
dsin
q
i.e.
f
=
f
q
(
)
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