Acrylic demonstration lenses include one each of double convex, double concave, plano-convex, Plano concave, concavo-convex, and convexo-concave. The focal length of each lens is 50 mm. The set includes a storage case.
Cylindrical lenses made of highly polished glass magnifies in only one dimension. These lenses are used in transforming a point image into a line or changing the height of an image without changing its width.