Physics

Problem

Visible light of wavelength 520 nm in air strikes a thin plastic film (n = 1.30) that coats glass (n = 1.50). Both the reflection at the air–film interface and the reflection at the film–glass interface undergo a 180° phase change. What is the minimum non-zero film thickness that produces maximum reflected intensity at this wavelength? a)

260\ \text{nm}

100\ \text{nm}

200\ \text{nm}

173\ \text{nm}

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