Solve: (a)
(b)
and
26.39. Set Up:
The bright fringes are located at angles of deviation
given by
The separation
d
between adjacent slits in the grating is
Solve: (a)
line:
and
line:
and
(b)
line:
and
line:
and
Reflect:
Light of longer wavelength is deflected through a larger angle.
26.40. Set Up:
Maxima are located by
The largest value
can have is
1.00.
Solve: (a)
Set
and solve for
m
:
The largest
is 3, so
there are 7 bright spots
.
(b)
and
26.41. Set Up:
The bright spots are located by
Thirdorder means
and secondorder means
Solve:
so
and
Reflect:
The thirdorder line for a particular
occurs at a larger angle than the secondorder line. In a given order,
the lines for violet light (400 nm) occurs at a smaller angle than the line for red light (700 nm).
26.42. Set Up:
The visible spectrum ranges between 400 nm and 700 nm. The maxima are located by
so the largest
is for the largest
The problem requires that
for
and
Solve for
d
.
Solve:
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 Spring '07
 Shoberg
 Diffraction, Wavelength, Sin, Visible spectrum

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