ch35-p118 - 118. Light reflected from the upper oil surface...

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118. Light reflected from the upper oil surface (in contact with air) changes phase by π rad. Light reflected from the lower surface (in contact with glass) changes phase by π rad if the index of refraction of the oil is less than that of the glass and does not change phase if the index of refraction of the oil is greater than that of the glass. First, suppose the index of refraction of the oil is greater than the index of refraction of the glass. The condition for fully destructive interference is 2 n o d = m λ , where d is the thickness of the oil film, n o is the index of refraction of the oil, λ is the wavelength in vacuum, and m is an integer. For the shorter wavelength, 2 n o d = m 1 λ 1 and for the longer, 2 n o d = m 2 λ 2 . Since λ 1 is less than λ 2 , m 1 is greater than m 2 , and since fully destructive interference does not occur for any wavelengths between,
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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