Lecture 22 Interference Homework due Wed…. Interference.

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Presentation transcript:

Lecture 22 Interference Homework due Wed…

Interference

Recall

Young’s double slit Interference Where are the fringes located?

Double slit demo What is the slit spacing?

Diffracted intensity

Newton’s Rings

Thin Film interference Soap film interference Where does the interference come from?

Anti-Reflection coatings First we want R 1 =R 2 D=(2m+1)n 2  /2

Thin film transmission

Fabry-Perot interferometer r=0.25 r=0.5 r=0.75 r=0.95

Coefficient of Finesse Airy Function

Finesse 22  1/2

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