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19. The maxima of a twoslit interference pattern are at angles
θ
given by
d
sin
θ
=
mλ
,where
d
is the slit
separation,
λ
is the wavelength, and
m
is an integer. If
θ
is small, sin
θ
may be replaced by
θ
in radians.
Then,
dθ
=
mλ
. The angular separation of two maxima associated with diFerent wavelengths but the
same value of
m
is ∆
θ
=(
m/d
)(
λ
2
−
λ
1
), and their separation on a screen a distance
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 Fall '08
 SPRUNGER
 Physics

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