PPT Slide
for small
q
m
l
d
=
sin
q
»
tan
q
=
y
L
\
position of FRINGES
y
bright
=
m
l
L
d
y
dark
=
m
+
1
2
(
)
l
L
d
Consider electric field intensity of
the two interfering light waves at the point P
E
1
=
E
0
sin
w
t
E
2
=
E
0
sin
w
t
+
f
(
)
f
only depends on path difference
d
path difference of one wavelength
l
c
phase difference of 2
p
radians
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