An additional objective lens is used to magnify and focus the image.
The laser scanning microscope passes a laser beam through an objective lens to illuminate a single point in an object.
The objective lens gathers light; its related number—in our case, 42—indicates the diameter of that lens in millimeters.
One example is this 248mm diameter objective lens of Venetian glass, previously the property of the first Astronomer Royal John Flamsteed FRS (1646–1719).
The objective lens forms a primary image at the rotating-mirror position.
Astigmatism may usually be completely corrected by use of the stigmators fitted to the objective lens.
Efforts to improve the resolution of the electron microscope have tended toward production of a single-field condenser-objective lens of low aberrations.
For example, the manufacturing and performance tolerances for a condenser or projector lens are less demanding than for an objective lens.
…varied, the electron microscope has variable-focus lenses, and the distance between specimen and objective lens and the separation of the lenses remain constant.
Roof-prism binoculars, which you can identify easily by their “H” shape, draw light in along a straight path through the binoculars, from the objective lens to the eyepiece.
Lenticulations (embossed lenslike shapes) on the film form the scanning lines and concentrate the incoming light into fine lines on the film, according to where the light comes from on the objective lens.
Further progress in the construction of electron microscopes was delayed during World War II but received an impetus in 1946 with the invention of the stigmator, which compensates for astigmatism of the objective lens, after which production became more widespread.
In telescope and microscope systems the cylindrical mount of the objective lens is generally the limiting aperture or iris of the system; its image, formed behind the eyepiece where the observer’s eye must be located to see the whole area being observed, called the field, is then the exit pupil.
Hence, star images appear brighter in proportion to the area of the telescope objective (assuming that the exit pupil is larger than the eye pupil), and the visibility of a star against the sky background is thus improved in proportion to the square of the diameter of the telescope objective lens.
To be sure, a telescope having a large objective lens accepts more light from an object in proportion to the area of the lens aperture, but it magnifies the image area in the same proportion; so the increased light is spread over an increased area of the retina, and the illuminance remains unchanged.
Transmission electron microscope (TEM), type of electron microscope that has three essential systems: (1) an electron gun, which produces the electron beam, and the condenser system, which focuses the beam onto the object, (2) the image-producing system, consisting of the objective lens, movable specimen stage, and intermediate and projector lenses, which focus the electrons passing through the specimen to form a real, highly magnified image, and (3) the image-recording system, which converts the electron image into some form perceptible to the human eye.
In April, Adriana Miele, a current Yale English student, wrote in the college newspaper: “We read Chaucer, but we are told to view his misogyny with an ‘objective’ lens, a daunting task for the one in three female students who have experienced sexual violence.”
Plus, the 42 objective-lens size is perfect for balancing brightness and clarity with weight.
The Athlons come with a set of press-in lens caps for the objective (larger) lens; most other binoculars use caps that fit over the lens.
The angular resolution of a telescope is equal to the angle subtended by the least resolvable image separation at the focal length of the objective, the light-gathering lens.
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