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In order to explain the positive temperature coefficient of the visible indexof refraction of fused silica I develop a simple model which assumes a singleultraviolet resonance. Assuming thermal broadening and using the Kramers-Kronig relations leads to a temperature coefficient in qualitative, but notquantitative, agreement with measurement.Comment: 3 pp, tex, Answer to Question # 50 in Am. J. Phy

Answer to Question #50. Temperature dependence of the index of refraction