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Introductory Physics Homework Help
Thinnest film that will give constructive interference for red light
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[QUOTE="prettykitty, post: 4298165, member: 447445"] So then the desired equation is 2ndcosθ=(m-.5)λ? How would I figure out the angle? I thought it was the right equation. Here is my instructors answer: If the thickness of the film is t, the difference in phase between a ray reflecting off the top surface of the film and one reflecting off the bottom surface of the film is (2πn/λ)2t + π the factor π coming from the phase change on reflection of the ray in air reflecting off the film. Set this phase change to 2π for the first constructive interference to get that t = λ/4n = 752/(4 × 1.33) = 141nm. I don't really understand how he got his answer either even though it is spelled out quite succinctly. [/QUOTE]
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Introductory Physics Homework Help
Thinnest film that will give constructive interference for red light
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