Three experiments involvong thin soap film(in air) are shown below. The index of refraction of the soap film is 1.25 and there is air above the soap film. In experiment I and III there is air below the soap film but in Experiment II there is glass (with index of refraction of 1.5) below the soap film. In all three expeiments the incident of light is nearly normal to the surface and has a wavelegnth of 250 nm in air. Note that the film thickness in each experiment is written on each diagram. a. What is the wavelegnth of the incident light while it is in the soap film? b Which of these three experiments will produce constructive interference as seen by the observer (i.e. the eye)?

Three experiments involvong thin soap film(in air) are shown below. The index of refraction of the soap film is 1.25 and there is air above the soap film. In experiment I and III there is air below the soap film but in Experiment II there is glass (with index of refraction of 1.5) below the soap film. In all three expeiments the incident of light is nearly normal to the surface and has a wavelegnth of 250 nm in air. Note that the film thickness in each experiment is written on each diagram. a. What is the wavelegnth of the incident light while it is in the soap film? b Which of these three experiments will produce constructive interference as seen by the observer (i.e. the eye)?

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