Physics II Lab w answers_Part_56

Physics II Lab w answers_Part_56 - Experiment 20 Air wedge:...

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123 Experiment 20 Air wedge: Interference of light Apparatus Glass plate, thin wire, beam splitter, light source, traveling microscope etc. Objective : To measure the diameter of a given thin wire using interference patterns formed using an extended source, at the air wedge between two glass plates. Theory: Interference effects are observed in a region of space where two or more coherent waves are superimposed. Depending on the phase difference, the effect of superposition is to produce variation in intensities which vary from a maximum of 2 2 1 ) ( a a + to a minimum of 2 2 1 ) ( a a - where 1 a and 2 a are amplitude of individual waves. For the interference effects to be observed, the two waves should be coherent. Interference patterns can be observed due to reflected waves from the top and bottom surfaces of a thin film medium. Because of the extended source, the fringes are localized at or near the wedge. Fig (1) shows the cross
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Physics II Lab w answers_Part_56 - Experiment 20 Air wedge:...

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