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Confused with physics problem?
A thin film of cinnamon oil (n=1.4) rests on top of a glass slide (n=1.5). If light of wavelength 500 nm travels through air before entering the cinnamon oil, what is the minimum thickness for destructive interference?
actually the first n=1.8
1 Answer
- Andrew SmithLv 76 days ago
I am not sure after the update. Case 1 cinnamon oil 1.4 and glass 1.5
there is a phase change at the first boundary and also one at the second so the light must move through a half wavelength for destructive interference. ie thickness = wavelength / 4
Case 2 cinnamon oil = 1.8 glass = 1.5. Phase change at the first boundary and NO phase change at the second. The light must move through a whole wavelength to give a net 180 degree phase. ie thickness = wavelength / 2
You must determine the wavelength in the cinnamon oil to complete the question.
