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Section # 001
Experiment #: 5
Date performed: 4708
Date due: 42108
Diffraction
Principal investigator: Clayton Spiceland_____________________________________
Skeptic:
Jay Patel ____________________________________________
Researcher
Simeon Cherrix_______________________________________
TA
Alec Sim____________________________________________
Role
I
DC
AD
RC
Q1
Q2
PI
PG
I
introduction
DC data and calculation
AD analysis and discussion
RC results and conclusion
Q1/Q2 quiz/prelab
PI principal investigator points
PG personal grade
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View Full DocumentIntroduction:
The purpose of this lab was to study the different properties of diffraction
gratings.
Each group in lab had a diffraction gradient with three settings of 100, 300, and
600 lines/mm.
The first part of the experiment was simply measuring the distance of the
1
st
and 2
nd
order using a laser and diffraction gradient.
The diffraction gradient had the
three settings 100, 300, and 600 lines/mm which means it could be used for multiple slits.
We used the following equation, with the wavelength of the laser being 655 +/ 25mm, to
determine the distance:
s
h
s
m
d
2
2
+
=
λ
The variable m represents the diffraction order.
When light passes through the diffraction
gradient there are visible spots to the left and right which are called orders.
The middle
point when looking through the gradient would have an order of 0 whereas the next point
that can be seen somewhat symmetrically on the left and right is the 1
st
order.
The
variable h represented the distance in between the clipboard and diffraction gradient.
The
variable s represents the distance between the orders and
λ
is obviously the wavelength.
The final result, d, represents the distance in between the grating slits.
Procedures: Part 1
1.) A laser was propped up on a wooden piece and a diffraction plate was set up in
front of the laser beam
2.) A clipboard was set up holding a white piece of paper to display the diffracted
light.
3.) The laser beamed through the 100 lines/mm setting and hit the paper at a good
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 Spring '08
 Cao
 Diffraction

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