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56. Since the slit width is much less than the wavelength of the light, the central peak of
the singleslit diffraction pattern is spread across the screen and the diffraction envelope
can be ignored. Consider three waves, one from each slit. Since the slits are evenly
spaced, the phase difference for waves from the first and second slits is the same as the
phase difference for waves from the second and third slits. The electric fields of the
waves at the screen can be written as
10
20
30
sin(
)
sin(
)
sin(
2 )
EE
t
t
t
ω
φ
=
=+
where
= (2
π
d
/
λ
) sin
θ
. Here
d
is the separation of
adjacent slits and
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Diffraction, Light

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