July21 - Whe ve two portions of thesam light arriveat thee...

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Whenever two portions of the same light arrive at the eye by different routes, either exactly or very nearly in the same direction, the light becomes most when the difference of the routes is any multiple of a certain length, and the least intense in the intermediate state of interfering portions; and this length is different for light of different colour. T. Young from a paper to the Royal Society in 1802
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s 1 s 2 Along the center line, it is obvious that the distances to two sources are identical. | r 1 -r 2 | = 0 and constructive int.    P θ dsin θ | r 1 - r 2 | = dsin θ = m λ Constructive Int. = (2m + 1) λ /2 Destructive Int. Interference phenomena ↔ Pathlength difference
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s =d(x/h) = m λ (0, ± λ , ± 2 λ , …) Constructive (m+1) λ /2 (± λ /2, ±3 λ /2,…) Destructive d(x/h) = m λ x = m(h/d) λ for constructive int.   d h x 0 1 1 2 2 3 3 2 nd -order bright fringe 2 nd  bright fringe
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: Each point on a wavefront acts as a new Source of identical waves. 0 th
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This note was uploaded on 07/16/2011 for the course PHY 2005 taught by Professor Lee during the Summer '08 term at University of Florida.

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July21 - Whe ve two portions of thesam light arriveat thee...

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