A procedure for observing diffraction from a circular aperture using photography equipment and commonly available light sources is presented. Commonly called the Airy pattern, such a diffraction pattern is characterized by a central bright spot, with concentric bright and dark rings. The images obtained in this procedure are suitable for discussing and demonstrating Rayleigh's criterion in introductory physics classes. It is shown that the patterns observed change as expected with wavelength and aperture.

1.
V.
Anantha Narayanan
and
Radha
Narayanan
, “
Inverse-square law of light with Airy's disk
,”
Phys. Teach.
37
,
8
9
(
1999
).
2.
Ronald E.
Jodoin
, “
Diffraction of a laser beam
,”
Am. J. Phys.
47
,
498
499
(
1979
).
3.
Joseph
van der Gracht
, “
Simple method for demonstrating Fraunhofer diffraction
,”
Am. J. Phys.
62
,
934
937
(
1994
).
4.
F. A.
Molby
, “
Diffraction of light: An experimental demonstration
,”
Am. J. Phys.
5
,
78
80
(
1937
).
5.
B.
Zhang
,
D.
Zhao
, and
S.
Wang
, “
Demonstrations of the diffraction and dispersion phenomena of part Fresnel phase zone plates
,”
Appl. Phys. Lett.
91
,
021108
(
2007
).
6.
Carl E.
Mungan
, “
Approximation for the Rayleigh resolution of circular aperture
,”
Phys. Teach.
47
,
288
289
(
2009
).
7.
Janelle
Van Dongen
and
Georg
Rieger
, “
A resource for using real-world examples in the physics classroom
,”
Phys. Teach.
51
,
105
107
(
2013
).
8.
Cambridge in Colour Webpage, <http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm> (last accessed June
2015
).
9.
Eugene
Hecht
,
Optics
, 4th ed. (
Addison-Wesley
,
Boston
,
2001
).
10.
In Excel, the syntax for the Bessel function is BESSELJ (E8,1), where, for example, cell E8 contains the value of variable x.
11.
Wolfgang
Rueckner
and
Costas
Papaliolios
, “
How to beat the Rayleigh resolution limit: a lecture demonstration
,”
Am. J. Phys.
70
,
587
594
(
2002
).
12.
A.
Bryce
and
E.
Bayer
, U.S. patent 3,971,065 (5 March
1975
).
13.
See <http://www.astrosurf.com/buil/50d/test.htm> (last accessed June
2015
).
14.
tracker, Video Analysis and Modeling tool, Douglas Brown, <https://www.cabrillo.edu/∼dbrown/tracker> (last accessed June
2015
).
15.
Data for typical, high-luminosity LEDs can be found at any electronics parts supplier such as Digikey.com. Panasonic Manufacturer Part No. LNJ03004BND1 shows a spectral emission curve typical of InGaN white LEDs.
16.
Ioannis
Pitas
,
Digital Image Processing Algorithms and Applications
(
John Wiley & Sons
,
New York
,
2000
).
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