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()
max
max
11077 nm
sin
25.5
435 nm
dd
m
θ
λλ
==
=
≈
which indicates (on one side of the interference pattern) there are 25 bright fringes.
Thus
on the other side there are also 25 bright fringes.
Including the one in the middle, then,
means there are a total of 51 maxima in the interference pattern (assuming, as the
problem remarks, that none of the interference maxima have been eliminated by
diffraction minima).
(c) Clearly, the maximum closest to the axis is the middle fringe at
= 0°.
(d) If we set
m
= 25 in Eq. 3625, we find
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 Spring '08
 Any
 Physics

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