Ray diagram for concave and convex mirrors
The line a–b representing the whole concave surface and a quarter of the convex mirror
The upper part of the sheet is filled with a large geometric diagram of two opposed fans of straight lines converging to a central point, a study of how rays behave with a curved mirror. A caption keyed to the line a–b explains that this line represents the whole of the concave part and, on the same line, one quarter of the convex mirror. Below and to the right stand a tall triangular stand or frame and further faint apparatus sketches associated with mirror-making. Additional mirror-script text on the sheet is not covered by the transcription.
On this page
Concave versus convex mirror on line a–b
A caption keyed to the line a–b states that on it the whole of the concave part is represented, and on the same line one quarter of the convex mirror (specchio colmo). The large fan of converging lines above illustrates the geometry of reflection from the curved surface.
Tall stand or apparatus
A tall triangular stand or frame is drawn at the centre-right of the sheet, of the kind associated with holding or grinding the mirrors studied in this group of folios.