Lecture-7-Optics
... The imaging of a point at S can result in a “comet-like” tail, known as a coma flare and forms a “comatic” circle on the screen (positive coma in this case). This is often considered the worst out of all the aberrations, primarily because of its asymmetric configuration. ...
... The imaging of a point at S can result in a “comet-like” tail, known as a coma flare and forms a “comatic” circle on the screen (positive coma in this case). This is often considered the worst out of all the aberrations, primarily because of its asymmetric configuration. ...
Ultra–large field-of-view two-photon microscopy
... The design of the scan system begins with the selection of the objective. We seek a field-ofview that encompasses 10 mm, a numerical aperture (NA) to achieve 1-µm resolution, and a back aperture that does not exceed 25 mm. The singular choice is a 4-times magnification (f = 45 mm), 0.28 NA air-immer ...
... The design of the scan system begins with the selection of the objective. We seek a field-ofview that encompasses 10 mm, a numerical aperture (NA) to achieve 1-µm resolution, and a back aperture that does not exceed 25 mm. The singular choice is a 4-times magnification (f = 45 mm), 0.28 NA air-immer ...
Telescope Quiz Review
... 2‐Star Auto Align – Revised procedure we use to do telescope alignment. Center one known star in the telescope eyepiece, then choose another named star to center to make the alignment more precise. 3 Star Alignment – use any three bright stars or objects for alignment, without knowing which stars ...
... 2‐Star Auto Align – Revised procedure we use to do telescope alignment. Center one known star in the telescope eyepiece, then choose another named star to center to make the alignment more precise. 3 Star Alignment – use any three bright stars or objects for alignment, without knowing which stars ...
The Electron Microscope as an Illustration of the Wave Nature of the
... In the electron microscope, the source of electrons is a heated filament of tungsten, from which the electrons are emitted or “boiled off”. In advanced forms of the electron microscope the source is very bright and is made from a sharp metal tip from which electrons are drawn out by an electric fiel ...
... In the electron microscope, the source of electrons is a heated filament of tungsten, from which the electrons are emitted or “boiled off”. In advanced forms of the electron microscope the source is very bright and is made from a sharp metal tip from which electrons are drawn out by an electric fiel ...
Scope Definitions
... lenses are single-coated. Exit Pupil n. The width of the viewable area seen through in the eyepiece of the scope. If the exit pupil is very small, (less than 4mm) the eye must be held very precisely in line with the scope to see. While the human eye doesn't use more than about 6mm at a time, a large ...
... lenses are single-coated. Exit Pupil n. The width of the viewable area seen through in the eyepiece of the scope. If the exit pupil is very small, (less than 4mm) the eye must be held very precisely in line with the scope to see. While the human eye doesn't use more than about 6mm at a time, a large ...
Session 10 Wave Optics
... fringes look like? a) there would be no fringes because waves of different frequency cannot interfere b) there would be no fringes because white light cannot be coherent c) the fringes would be in black and white d) the fringes in different colours would be displaced and would overlap 4. What is the ...
... fringes look like? a) there would be no fringes because waves of different frequency cannot interfere b) there would be no fringes because white light cannot be coherent c) the fringes would be in black and white d) the fringes in different colours would be displaced and would overlap 4. What is the ...
Airy disk
In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The Airy disk is of importance in physics, optics, and astronomy.The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern. Both are named after George Biddell Airy. The disk and rings phenomenon had been known prior to Airy; John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia Metropolitana:...the star is then seen (in favourable circumstances of tranquil atmosphere, uniform temperature, &c.) as a perfectly round, well-defined planetary disc, surrounded by two, three, or more alternately dark and bright rings, which, if examined attentively, are seen to be slightly coloured at their borders. They succeed each other nearly at equal intervals round the central disc....However, Airy wrote the first full theoretical treatment explaining the phenomenon (his 1835 ""On the Diffraction of an Object-glass with Circular Aperture"").Mathematically, the diffraction pattern is characterized by the wavelength of light illuminating the circular aperture, and the aperture's size. The appearance of the diffraction pattern is additionally characterized by the sensitivity of the eye or other detector used to observe the pattern.The most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk. Even if one were able to make a perfect lens, there is still a limit to the resolution of an image created by this lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.