Experiment 7: lloyd’s mirror – PASCO WA-9316A Complete Microwave Optics System User Manual
Page 38

Experiment Guide
Teacher’s Guide
38
2. Single-slit diffraction may also be attempted on this apparatus, though we don’t recommend it. The distances are too short,
relative to the wavelength; so the analysis requires the Fresnel/Kirchoff approach instead of the Fraunhoffer approxima-
tion. Even with the Fresnel approach, the “fringes” are too small to be seen adequately.
•
Basically, it doesn’t work well at all.
Experiment 7: Lloyd’s Mirror
Notes on the Procedure
Average: 27.59 mm
Standard deviation: 1.37
An alternate method is to graph path length versus fringe number and take
the slope of the graph. This slope will be the wavelength.
Answer to the Question
•
It simplifies the calculations.
Fringe
h (mm)
Path length (mm)
Wavelength (mm)
1
85
720
2
138
752
32.10
3
171
779
26.63
4
200
806
27.15
5
227
834
28.11
6
251
861
27.06
7
276
890
28.83
8
298
919
29.13
9
317
944
25.08
10
338
973
28.69
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