The Thickness of the Rigid Water Film at a Quartz-Water Interface from a Measurement of Newton's Rings

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Abstract
The thickness of the water film between a quartz lens and disk was determined by measuring the radii of successive Newton's rings. The squares of these radii are a linear function of the order of the rings from the center, the intercept of the extrapolated graph of which is a function only of the radius of curvature of the lens and the vertical separation of the lens and plate. By comparing intercepts obtained from data taken before and after evaporation of a water layer, a value of the order of 100A was obtained for the thickness of the water film of each interface.

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