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Constructive Interference with Minimum Thickness

Assuming that x is the wavelength of light in oil (they used a different variable but my PC cant reproduce that symbol), for an oil film on water, constructive interference occurs with the minimum film thickness of:

a. 2x
b. x/4
c. x
d. x/2

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The beam is incident in-phase. Reflection causes the in-phase beam to go out-of-phase. ...

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