Ray diagrams through a lens-like figure
Two optical studies of rays radiating to and from a focal point
The leaf bears two finely drawn diagrams and, as the editorial note states, no writing. The upper diagram shows a lens- or eye-like form built from concentric arcs with a bundle of straight rays radiating from a point on its left and a long tapering tail extending to the right. The lower diagram encloses a similar pointed lens shape within a square, with rays crossing at a central point. Both read as geometrical studies of how rays converge on and diverge from a focus.
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Rays converging through a lens-shaped figure
A pointed, lens- or eye-like form of concentric arcs has a fan of straight rays radiating from a focal point at its left, while a long narrow tail tapers away to the right. The construction reads as a study of rays passing to and from a single focus.
Lens figure inscribed in a square
A second lens-shaped figure is set inside a ruled square, with straight rays crossing at a central point within it. The square provides a geometric frame for the converging rays.