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Thus, the phase difference at point
P
is
φ
=d
sin
θ
/λ
= 0.397 wavelengths, which means it
is between the central maximum (zero wavelength difference) and the first minimum (
1
2
wavelength difference).
Note that the above computation could have been simplified
somewhat by avoiding the explicit use of the tangent and sine functions and making use
of the smallangle approximation (tan
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 Spring '08
 Any
 Physics

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