Problem $25\mathrm{.}018$ A soap bubble viewed in reflected light

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A soap bubble has an index of refraction n $=1\mathrm{.}35.$ The bubble is viewed in reflected light.

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Problem $25\mathrm{.}018.$b $1$ The longest visible wavelength enhanced in the reflected light

At a spot where the film thickness is $951\mathrm{.}0$ nm$,$ what is the longest visible wavelength which is enhanced in the reflected light?