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Thin films: reflection between glass plates
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[QUOTE="vetgirl1990, post: 5453045, member: 573977"] [h2]Homework Statement [/h2] Two parallel glass plates of index of refraction n are separated by an air film of thickness d. Light of wavelength λ in air, normally incident on the plates, is intensified on reflection when, for some integer m a) 2d=mλ b) 2d=mλ/n c) 2d=mnλ d) 2d=(m+1/2)λ e) 2d=mλ/2 [h2]Homework Equations[/h2] If only one ray is π shifted: 2nd=mλ (min), 2nd=(m+1/2)λ (max) If both rays π shifted: 2nd=mλ (max), 2nd=(m+1/2)λ (min) [h2]The Attempt at a Solution[/h2] I've attached a diagram of two different for how I picture light should be transmitted in this problem. I'm not sure which one would be a correct approach. Going with the first diagram, This would result in a net π shift, so it's conditions would be 2nd=mλ (min) and 2nd=(m+1/2)λ (max). I chose answer [B](B) 2d=mλ/n[/B], since the question asks for "intensity increase" so I am assuming it is asking about the condition for a bright fringe; and also because it's one of the only options that takes the index of refraction (n) into account. I would just like to verify that my reasoning is correct. [/QUOTE]
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Thin films: reflection between glass plates
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