Instead of a concave lens near the eye, Kepler used a convex lens. The result was that the image magnified by the convex objective lens was further magnified by the now-convex eyepiece lens.

A lens is a specially shaped pieces of glass or transparent plastic, that is used to focus light. A convex lens is made from a transparent material that bulges outwards in the middle on both sides.

Lenticular 3D uses a convex lens to direct the eyes appropriately. Left and right frames appear as columns of pixels or blocks of pixels for multi-view images. THIS DEFINITION IS FOR PERSONAL USE ...

Figure 4 schematically depicts the relationship among the lens array planes, the convex lenses ... Energy Laboratory Co., Ltd., were used. This manuscript is a revised and extended version ...