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Chapt. 36 Interference 277
a) Draw a diagram of the system.
b) Solve for
θ
′
.
c) For the small angle approximation, de±ne an new angle
θ
′′
(in terms of both
θ
′
and
θ
′′
)
such that we you have a formula for
θ
′′
that exactly resembles the formula for
θ
in the
exact alignment case.
d) Why don’t we ever worry about disalignment in undergraduate experiments?
036 qfull 00700 2 5 0 moderate thinking: FWHM for two slit
7. The intensity function for the far±eld twoslit interference pattern is
I
= 4
I
0
r
2
cos
2
(
α
)
,
where
r
is the distance from the slits to the screen,
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 Fall '11
 Dr.Acost
 Physics

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