School of Physics Lecture Demonstration Manual

Od-1 Diffraction (Using 1, 2, 4, 8, 16 Slits)

Published: Wednesday 15 March 2006 - Updated: Monday 28 March 2011


To demonstrate the diffraction pattern of a multi slit object.



Click on pictures to enlarge.

Slit Diffraction Diagram


The laser is directed onto the portion of the slide containing the slit arrangement required. The resulting diffraction pattern displayed on the projection screen is bright enough to be clearly seen by the class. An alternative setup uses the spatial filter and/or the collimator together with the T.V camera viewing the image formed on the groundglass screen.

Safety notes

Electrical safety 

Laser safety 

Sharps safety 


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