White Light

White light is shined onto a film with an index refraction of n=1.5 How thick to absorb green light?
White light is shined perpendicularly onto a film with an index refraction of n=1.5 How thick would the film have to be to absorb green light due to destructive interference? f of green light= 5.45 x 10^14 Hz
This question cannot be definitively answered with the information supplied. You see, the answer will be different if the film is on a medium with a lower index than 1.5 (in which case there will be a phase shift at the top surface and not at the bottom) or a higher index than 1.5 (in which case there will be a phase shift on BOTH interfaces); or if it’s on a medium with exactly the same index, there is no way the coating can create interference effects at all.
Gorillaz-White Light
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