A diagram which shows light being refracted by a spherical glass container full of water.

Roger Bacon's diagram relating to the scientific study of optics.

• Title: Opus Majus or De multiplicatione specierum or possibly De natura locorum (?)
• Author: Bacon, Roger or possibly Grosseteste, Robert
• Production: England; 13th century
• Language: Latin

The British Library, the holder of the manuscript and producer of the web page on which this image appears, describes the image as:

Shelfmark: Royal 7 F. VIII

Page Folio Number: f.25

Title of Work: De multiplicatione specierum

Author: Bacon, Roger

Production: England; late 13th century

The BL web page contains the disclaimer that "All efforts have been made to ensure the accuracy of the information contained in the above description, but the British Library cannot accept responsibility for any errors that may occur."

A. C. Crombie, Robert Grosseteste and the Origins of Experimental Science, Fig. 2 describes this diagram as follows:

Diagram illustrating Grosseteste's theory, in De Nat. Loc. (see pp. 122, 149) of the focusing of the sun's rays by a spherical lens; from Roger Bacon's Opus Maius, iv. ii. 2, MS Roy. 7. F. viii, f. 25v....

Apparently based on Crombie, Colin A. Ronan. The Cambridge illustrated history of the world's science, 1983, attributes the image to Grosseteste's De natura locorum.

Adapted from: http://www.imagesonline.bl.uk/britishlibrary/controller/textsearch?text=bacon&y=0&x=0&startid=32112&width=4&height=2&idx=2^{[link morto]}

Esta é unha reproducción fotográfica fiel dunha obra de arte bidimensional no dominio público. A obra de arte en si mesma atópase no dominio público polo seguinte motivo: Public domainPublic domainfalsefalse Este material está no dominio público nos demais países onde os dereitos de autor se estenden por 70 anos (ou menos) trala morte do autor. Debe incluír tamén unha etiqueta de dominio público dos Estados Unidos para indicar por que esta obra se atopa no dominio público nos Estados Unidos.  Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information). Este ficheiro foi identificado como libre de restricións baixo as leis de dereitos de autor, incluídos todos os dereitos relacionados. https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse A posición oficial da Fundación Wikimedia é que "as reproducións fieis de obras de arte bidimensionais no dominio público atópanse en si mesmas no dominio público". Esta reprodución fotográfica considérase polo tanto no dominio público. Noutras xurisdicións a reutilización deste contido pode estar rextrinxida; vexa Reutilización de fotografías PD-Art para máis información. {{PD-Art}} template without license parameter: please specify why the underlying work is public domain in both the source country and the United States (Usage: {{PD-Art|1=|deathyear=''year of author's death''|country=''source country''}}, where parameter 1= can be PD-old-auto, PD-old-auto-expired, PD-old-auto-1996, PD-old-100 or similar. See Commons:Multi-license copyright tags for more information.)