45. The ruling separation is
d
= 1/(400 mm
–1
) = 2.5
×
10
–3
mm.
Diffraction lines occur at angles
θ
such that
d
sin
=
m
λ
, where
λ
is the wavelength and
m
is an integer. Notice that for a given order, the line associated with a long wavelength
is produced at a greater angle than the line associated with a shorter wavelength. We take
λ
to be the longest wavelength in the visible spectrum (700 nm) and find the greatest
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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

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