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Material Type: Lab; Class: Experimental Physics I; Subject: Physics; University: Syracuse University; Term: Spring 2007;
Typology: Lab Reports
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March 2007
The main objectives for this experiment are:
Light from coherent sources interferes (see the reference for an expla- nation of the coherent sources). The coherent sources can be obtained from a single source using Young’s double slits (or Young’s multiple slits), or by creating virtual sources by diffracting light over a mirror. Thomas Young first verified this experimentally by producing two coher- ent light sources by dividing a light wavefront from a single source, as shown in figure(1). Light intensity I at point P of the screen located at the distance s, de- pends on the path difference from the sources ∆r = r 2 −r 1 shown in figure(2),
I = I 1 + I 2 + 2
√ I 1 I 2 cosδ, (1) As an exercise derive the above formula where,
δ =
2 π λ
∆r. (2)