Patent ID: 8233221

Claim:
An adjustable lens system including a container enclosing a first fluid (F 1 ) arranged with an interface (I) to an electrically susceptible second fluid (F 2 ), wherein the interface (I) is arranged to refract incoming waves, wherein the first and second fluids (F 1 , F 2 ) are immiscible, wherein the first and second fluids (F 1 , F 2 ) are selected such that they together exhibit a mechanical damping which is critical or near critical, and wherein a shape of the interface (I) is adjustable upon application of an electric voltage (VC), and a control circuit (CC) arranged to generate the electric voltage (VC), wherein the control circuit (CC) is arranged to change the electric voltage (VC) from a first voltage (V 1 ) to a second voltage (V 2 ) different from the first voltage (V 1 ) such that a rate of voltage change is limited to avoid oscillation of the interface (I), thereby adjusting refraction of incoming waves at the interface (I) from a first refraction to a second refraction in a continuous and controlled manner.