Variable Focal Length Lenses Made of Gelatin.

This article describes our efforts to make variable focal length lenses using gelatin for use in physics instruction. Although a lens mold was produced in this experiment, a plano-convex lens that converges light can be made more easily by pouring gelatin sol into a hemispherical container without the making process of the lens mold. Therefore, there is a need to produce an educational variable focal length lens that can be easily and safely made and manipulated by teachers and students with materials readily available around them while the material of the actual lens and the ciliary body have similar principles for changing the lens. The lens mold is made of half-sphere silicone baking molds for cooking, and the lens mount is made of laminating film, and the variable focal length lens was reproduced to be elastic like a human lens. [Extracted from the article]