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Physical optics/constructive and destructive reflection

Hi. Can someone please show me how to do the following problem? Thank you.

White light is incident normally on a thin soap film (n = 1.33).

(a) What are the two minimum thicknesses that will constructively reflect visible light with = 676 nm?

smallest thickness (in nm)

second smallest thickness (in nm)

(b) What are the two minimum (non-zero) thicknesses that will destructively reflect visible light with = 676 nm?

smallest thickness (in nm)

second smallest thickness (in nm)

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