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RickStudent, Philosopher, Writer, Developer
Parallel rays coming into a parabolic mirror are focused at a point F. The vertex is V, and the axis of symmetry passes through V and F. For off-axis reflectors (with just the part of the paraboloid between the points P1 and P3), the receiver is still placed at the focus of the paraboloid, but it does not cast a shadow onto the reflector.
Parabolic Mirror — Parallel rays coming into a parabolic mirror are focused at a point F. The vertex is V, and the axis of symmetry passes through V and F. For off-axis reflectors (with just the part of the paraboloid between the points P1 and P3), the receiver is still placed at the focus of the paraboloid, but it does not cast a shadow onto the reflector.
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=3222214
Parabolic Mirror Parallel rays coming into a parabolic mirror are focused at a point F. The vertex is V, and the axis of symmetry passes through V and F. For off-axis reflectors (with just the part of the paraboloid between the points P1 and P3), the receiver is still placed at the focus of the paraboloid, but it does not cast a shadow onto the reflector.
Archimedes may have used mirrors acting collectively as a parabolic reflector to burn ships attacking Syracuse.
Parabolic Reflector — Archimedes may have used mirrors acting collectively as a parabolic reflector to burn ships attacking Syracuse.
Photo Credit: By Finnrind (original); Pbroks13 (talk) (redraw) - Image:Archimedes Heat Ray conceptual diagram.png, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4233991
Parabolic Reflector Archimedes may have used mirrors acting collectively as a parabolic reflector to burn ships attacking Syracuse.
Artist Giulio Parigi's interpretation of Archimedes' mirror used to burn Roman ships. c. 1599
Archimedes' mirror — Artist Giulio Parigi's interpretation of Archimedes' mirror used to burn Roman ships. c. 1599
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=9007560
Archimedes' mirror Artist Giulio Parigi's interpretation of Archimedes' mirror used to burn Roman ships. c. 1599
In the Archimedes Palimpsest
A page from On Floating Bodies — In the Archimedes Palimpsest
Photo Credit: By Matthew Kon - http://www.lix.polytechnique.fr/Labo/Ilan.Vardi/arch_eabig.jpg?36,70, Public Domain, https://commons.wikimedia.org/w/index.php?curid=30276470
A page from On Floating Bodies In the Archimedes Palimpsest
16th-century carving of Archimedes in the bath, with Hiero's crown at bottom right
Archimedes in his bath — 16th-century carving of Archimedes in the bath, with Hiero's crown at bottom right
Photo Credit: By Unknown - Historia N° 767 - Novembre 2010 - page 38, Public Domain, https://commons.wikimedia.org/w/index.php?curid=12080104
Archimedes in his bath 16th-century carving of Archimedes in the bath, with Hiero's crown at bottom right
by Thomas Degeorge (1815)
The Death of Archimedes — by Thomas Degeorge (1815)
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=34804881
The Death of Archimedes by Thomas Degeorge (1815)
by Domenico Fetti (1620)
Archimedes Thoughtful — by Domenico Fetti (1620)
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=146592
Archimedes Thoughtful by Domenico Fetti (1620)
cropped
Archimedes — cropped
Photo Credit: By Domenico Fetti - http://archimedes2.mpiwg-berlin.mpg.de/archimedes_templates/popup.htm, Public Domain, https://commons.wikimedia.org/w/index.php?curid=146592
Archimedes cropped
Believed to be the burial site of St. Peter, seen from the River Tiber
St. Peter's Basilica — Believed to be the burial site of St. Peter, seen from the River Tiber
Photo Credit: By Sébastien Bertrand from Paris, France - Flickr, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=1800430
St. Peter's Basilica Believed to be the burial site of St. Peter, seen from the River Tiber
Painted 1601 by Caravaggio
The Crucifixion of Saint Peter — Painted 1601 by Caravaggio
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=44143232
The Crucifixion of Saint Peter Painted 1601 by Caravaggio
In the Basilica of Saint Paul outside the Walls
Saint pope Peter — In the Basilica of Saint Paul outside the Walls
Photo Credit: By Unknown - [1], Public Domain, https://commons.wikimedia.org/w/index.php?curid=42215609
Saint pope Peter In the Basilica of Saint Paul outside the Walls
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