THIN FILM INTERFERENCE





Constructive: 2t = (m + 1/2)(λ/n) in one special case!

Destructive: 2t = m (λ/n) in one special case!
Here m is any positive integer. These equations are for the case that n_film is greater than n_air. Instead of “remembering a formula,” which will be inappropriate half the time, it is vital to work out the path and phase differences from scratch in each individual example.

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THE INTERFEROMETER
LIGO, the gravitational radiation observatories.










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