Figure 4
From: Electrowetting lens with large aperture and focal length tunability
(a) Dependence of radius of meniscus on the optical aperture and applied voltage and the applied voltage, (b) the radius of meniscus is linearly related to the optical aperture, the slope of the curve has the value of \(1/\cos \theta\), (c) the reciprocal of the radius of meniscus is proportional to the square of the applied voltage.
