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Lo9

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Catherinee Lin

This document discusses thin film interference from plating a thin layer of MgF2 on glass. It asks what the least thickness of the MgF2 layer should be to minimize reflection of light with a wavelength of 5000 normally incident from air to the glass. The answer is that the least thickness is 906 in order to minimize reflection when the optical path difference is equal to the wavelength (k=1).

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Physics Learning Object 9 Yiying Lin 15621148 Thin Film Interference Question Plating a thin layer of MgF2 (refractive index n=1.38) on a piece of glass (n=1.60) as an antireflection film. A light has a wavelength 5000 that has a normal incidence through the glass from the air (n=1.00). If the reflex is minimized, what is the least thickness of MgF2 layer? A. 1250 B. 906 C. 2500 D. 871 Answer1 906 When k=1, it is the thinnest.

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Lo9

  • 1. Physics Learning Object 9 Yiying Lin 15621148 Thin Film Interference Question Plating a thin layer of MgF2 (refractive index n=1.38) on a piece of glass (n=1.60) as an antireflection film. A light has a wavelength 5000 that has a normal incidence through the glass from the air (n=1.00). If the reflex is minimized, what is the least thickness of MgF2 layer? A. 1250 B. 906 C. 2500 D. 871 Answer1 906 When k=1, it is the thinnest.