A thin film of polystyrene is used as an antireflectivecoating for fabulite (kno

Question

A thin film of polystyrene is used as an antireflectivecoating for fabulite (known as the substrate). The index ofrefraction of the polystyrene is 1.49, and the index of refractionof the fabulite is 2.409. What is the minimum thickness of filmrequired? Assume that the wavelength of the light in air is 520nanometers. A thin film of polystyrene is used as an antireflectivecoating for fabulite (known as the substrate). The index ofrefraction of the polystyrene is 1.49, and the index of refractionof the fabulite is 2.409. What is the minimum thickness of filmrequired? Assume that the wavelength of the light in air is 520nanometers. What is the minimum thickness of filmrequired? Assume that the wavelength of the light in air is 520nanometers. What is the minimum thickness of filmrequired? Assume that the wavelength of the light in air is 520nanometers. What is the minimum thickness of filmrequired? Assume that the wavelength of the light in air is 520nanometers.

Explanation / Answer

We know that thickness                 t = / 4 ( 2 - 1)                   = 520 nm / 4 (2.409 - 1.49)                   = 141.45 nm                   = 0.14145 x 10-4 cm

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