Fig. 1. Structure of self-zoom liquid lens

Fig. 2. Photos of the three-liquid lens

Fig. 3. Relationship between the applied voltage U (U₁ or U₂) at the liquid interface and radius of curvature R (R₁ or R₂)

Fig. 4. Relationship of curvature 1/R₁ and 1/R₂ of two liquid interfaces

Fig. 5. Relationship between the applied voltages U₁ and U₂ at the two liquid interfaces

Fig. 6. Relationship between the applied voltage U₁ and the total focal length f of the system