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Unformatted text preview: (A) Assuming the lateral shrinkage is small compared to the change in thickness when the lens dries, calculated the thickness of the dry lens. (B) Assuming that the drying of the contact lens is limited by evaporation of water from the lens surface to the surrounding vacuum where the water vapor concentration is essentially zero, sketch a series of composition profiles that describe the water content of the lens as a function of position across the lens thickness. (C) How would these composition profiles change if the evaporation were limited by water diffusion within the lens rather than by evaporation at the surface? Use sketches as appropriate to illustrate your thinking. Scan multiple choice review questions and practice on many of them....
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- Spring '09