The Physics
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Opus in profectus

Thin Film Interference

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Summary


Two easy to remember thin film examples
antireflection
coating
soap
bubble
desired effect destructive interference on reflection for incident rays normal to the surface of the film
indexes nair < nfilm < nglass nair < nwater > nair
film thickness t = ¼λ′ t = ½λ′
mnemonic "order quarter" "bubble undouble"