Lenses and Waves: Christiaan Huygens and the Mathematical
... optics. The historian who does so on the basis of existing literature, awaits a surprise. There is much more to Huygens’ optics than waves. He elaborated a comprehensive theory of the dioptrical properties of lenses and their configurations in telescopes, that goes by the title of Dioptrica. A secon ...
... optics. The historian who does so on the basis of existing literature, awaits a surprise. There is much more to Huygens’ optics than waves. He elaborated a comprehensive theory of the dioptrical properties of lenses and their configurations in telescopes, that goes by the title of Dioptrica. A secon ...
Famous optician: Johannes Kepler
... Cosmographicum, he invited Kepler to join him. It was an extraordinary opportunity that arose at exactly the right time, for because of his Protestant faith and Copernican ideas, Kepler was facing exile. He duly took refuge in Prague in 1600, and become assistant mathematician to Tycho Brahe. For so ...
... Cosmographicum, he invited Kepler to join him. It was an extraordinary opportunity that arose at exactly the right time, for because of his Protestant faith and Copernican ideas, Kepler was facing exile. He duly took refuge in Prague in 1600, and become assistant mathematician to Tycho Brahe. For so ...
time is not relative - The General Science Journal
... for the fixed observer. (Understanding this optical illusion, indicates we should be more careful in our assumptions. For example, a star sends out light with a constant frequency. Depending on the direction of movement, we observe that when the star is moving away, the light will suffer a displacem ...
... for the fixed observer. (Understanding this optical illusion, indicates we should be more careful in our assumptions. For example, a star sends out light with a constant frequency. Depending on the direction of movement, we observe that when the star is moving away, the light will suffer a displacem ...
Early Estimates of the Velocity of Light
... sisted.61From observations of the parallax of Mars made in 1671 to 1673the very years in which ROEMER was observing the satellites of Jupiter-a solar distance of 91,600 terrestrial radii was obtained.62This was frequently more roundly expressed as 22,000 earth radii.63PICARD had in the years just pr ...
... sisted.61From observations of the parallax of Mars made in 1671 to 1673the very years in which ROEMER was observing the satellites of Jupiter-a solar distance of 91,600 terrestrial radii was obtained.62This was frequently more roundly expressed as 22,000 earth radii.63PICARD had in the years just pr ...
if there is any current in the river
... was because of the time it took for Jupiter's light to reach us. Taking into account what was known about planetary distances, his observations implied a light speed of about 225,000 kilometers (140,000 miles) per second. ...
... was because of the time it took for Jupiter's light to reach us. Taking into account what was known about planetary distances, his observations implied a light speed of about 225,000 kilometers (140,000 miles) per second. ...
Document
... bouncing it off a rotating mirror and measuring time • The light returned to its source at a slightly different position because the mirror has moved during the time light was traveling • The deflection angle depends on the speed of light and the dimensions of the apparatus. ...
... bouncing it off a rotating mirror and measuring time • The light returned to its source at a slightly different position because the mirror has moved during the time light was traveling • The deflection angle depends on the speed of light and the dimensions of the apparatus. ...
The University of Georgia Department of Physics and Astronomy
... sheet of paper that you submit. This is a closed-book, closed-notes exam. You may use a calculator, but only for arithmetic functions (i.e., not for referring to notes stored in memory, doing symbolic algebra, etc.). For full credit, you must show your work and/or explain your answers. This part has ...
... sheet of paper that you submit. This is a closed-book, closed-notes exam. You may use a calculator, but only for arithmetic functions (i.e., not for referring to notes stored in memory, doing symbolic algebra, etc.). For full credit, you must show your work and/or explain your answers. This part has ...
Rømer's determination of the speed of light
Rømer's determination of the speed of light was the demonstration in 1676 that light has a finite speed, and so doesn't travel instantaneously. The discovery is usually attributed to Danish astronomer Ole Rømer (1644–1710), who was working at the Royal Observatory in Paris at the time.Rømer estimated that light would take about 22 minutes to travel a distance equal to the diameter of Earth's orbit around the Sun: this is equivalent to about 220,000 kilometres per second in modern units, about 26% lower than the true value.Rømer's theory was controversial at the time he announced it, and he never convinced the director of the Royal Observatory, Giovanni Domenico Cassini, to fully accept it. However, it quickly gained support among other natural philosophers of the period, such as Christiaan Huygens and Isaac Newton. It was finally confirmed nearly two decades after Rømer's death, with the explanation in 1729 of stellar aberration by the English astronomer James Bradley.