HW 5-Optical Instruments0

HW 5-Optical Instruments0 -...

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Unformatted text preview: Op#cal
Instruments
Homework
 1.  Use
 the
 Wein
 displacement
 law
 to
 calculate
 the
 wavelength
 emi=ed
 by
 a
 blackbody
that
has
been
heated
to
5000
K.
 2.  Use
 Stefan’s
 law
 to
 calculate
 the
 total
 energy
 output
 in
 W/m2
 for
 the
 blackbody
radiator
in
Q1.
 3.  How
 many
 lines
 per
 millimeter
 in
 a
 gra#ng
 would
 be
 required
 for
 the
 first‐ order
diffrac#on
line
for
 l
=
400
nm
to
be
observed
at
a
reflec#on
angle
of
5
 degrees
when
the
angle
of
incidence
is
45
degrees.
 4.  A
 monochromator
 has
 a
 focal
 length
 of
 1.6
 m
 and
 a
 collima#ng
 mirror
 with
 diameter
of
3.5
cm.
The
dispersing
device
was
a
gra#ng
with
1500
lines/mm.
 For
first‐order
diffrac#on,
what
is
the
resolving
power
of
the
monochromator
if
 a
collimated
beam
illuminated
3.0
cm
of
the
gra#ng?
 5.  What
 length
 of
 mirror
 drive
 in
 a
 Michelson
 interferometer
 is
 required
 to
 produce
 a
 resolu#on
 sufficient
 to
 separate
 IR
 peaks
 at
 4002.1
 and
 4008.8
 cm‐1?
 Due
Wed
9/21
 ...
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