Please show work and answer in terms of wavelength vs. n ratio. these are the an

Question

Please show work and answer in terms of wavelength vs. n ratio.

these are the answers:

Monochromatic light of wavelength, lambda is traveling in air. The light then strikes a thin film having an index of refraction n1 that is coating a material having an index of refraction n2. If n2 is larger than n1, what minimum film thickness will result in maximum reflection of this light? A lambda / 2 lambda / n1 lambda / 4 lambda / (2n2) lambda / n2 lambda / (4n1) lambda / (2n1) lambda / (4n2) lambda The correct response is not shown above.

Explanation / Answer

min thickness to have max reflection is /n2

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