Seeing the Light Optical (Visual) Illusions, J. C. Bose and Table Top Experimental Science Rajarshi Roy Institute for Physical Science and Technology Department of Physics Institute for Research in Electronics and Applied Physics University of Maryland, College Park MD 20742 USA [email protected]IPR HSND February, 2015
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Seeing the LightOptical (Visual) Illusions, J. C. Bose and Table Top Experimental Science
Rajarshi RoyInstitute for Physical Science and Technology
Department of PhysicsInstitute for Research in Electronics and Applied Physics
caused by abnormalities of the photoreceptors (rods and cones) or the retinal pigment epithelium (RPE) of the retina leading to progressive sight loss.
1888-1894: As German physicist Heinrich Hertz proves experimentally the existence of electromagnetic waves in free space, Bose starts pursuing follow-up microwave research, and ultimately succeeds in reducing the wave-length to the millimetre level.
1895: In a public demonstration at the Town Hall in
Kolkata, in presence of Sir William Mackenzie, the Lieutenant Governor of Bengal, Bose ignites gunpowder and rings a bell at a distance using millimetre range wave-length microwaves. Writes an important essay, titled
Adrishya Alok (Invisible Light), in Bengali.
J. C. Bose (1858 – 1937)
Teachers at Cambridge: Lord Rayleigh (Physics), Sir Francis Darwin (Botany)
The first person who applied semiconductors for practical purposes, was the Indian polymath Sir Jagadish Chandra Bose (1858-1937). He was a physicist, biologist, botanist, archaeologist, and writer of science fiction.
He invented several semiconductor devices, the first of which
was the Galena detector, which he demonstrated in a Royal
Institution Discourse in 1900.
He called his galena point contact detector an artificial retina (because by suitable arrangement it could be made to detect only light waves), a universal radiometer.
Bose was awarded the first patent for a semiconductor device in the world, namely for the Galena detector.
Artificial retina today
Attorney Dean Lloyd sits at his office in Palo Alto, California.
Lloyd, who went blind from retinitis pigmentosa, had experimental
electrodes implanted in the back of his right eye. Lloyd wears
black sunglasses containing a tiny camera and transmitter, a video
processor and battery pack on his belt. Lloyd is among only 10
people in the United States to undergo the procedure.
Alongside Large Scale Science and Technology Projects
Thanks for listening!!
Father William
“You are old, Father William,” the young man said,“And your hair has become very white;And yet you incessantly stand on your head –Do you think, at your age, it is right?”
“In my youth,” Father William replied to his son,“I feared it might injure the brain;But, now that I'm perfectly sure I have none,Why, I do it again and again.”
Lewis Carroll, Alice's Adventures in Wonderland (1865)
Visual latency
• Bio-feedback loop
• Measure latency time with a meter stick!
SQRT(2D/g)
(g ~ 10 m/s/s)
August 2, 2005
Abdus Salam (1926 – 1996)
Nobel Prize in Physics, 1979 (with Weinberg and Glashow)
A biological researcher experimented with a flea, which has six legs.
He puts it on the table and says: "Jump!"The flea jumps 3 meters, so he writes down to his log:
"The flea has jumped 3 meters."Afterward he cuts one of its legs off and says again: "Jump!"The flea jumps only 2 meters, so he writes down to the log:
"The flea has jumped 2 meters."Then he again cuts one more leg, again says: "Jump!"It jumped 1.5 meters, which was also registered in the log.
He continued cutting the fleas' legs until there were no legs left, he puts it on the table and says: "Jump!"The flea doesn't move.He says again: "Jump!"It doesn't move.So he writes down
"After removing all legs of the flea, the flea loses its ability to hear.“
A very nice reproducible experiment !
http://en.wikipedia.org/wiki/Spin
ning_Dancer#mediaviewer/File:S
pinning_Dancer.gif
The Spinning Dancer, also known as the silhouette illusion, is a kinetic,
bistable optical illusion resembling a pirouetting female dancer.
The illusion, created in 2003 by web designer Nobuyuki Kayahara,[1][2]
involves the apparent direction of motion of the figure. Some observers
initially see the figure as spinning clockwise (viewed from above) and
some anti-clockwise. Additionally, some may see the figure suddenly spin