magnifying power

magnifying power

(magnification) The angle subtended by the image of an object seen through a telescope, divided by the angle subtended by the same object seen without telescopic aid. Where the object is too small or too distant to be resolved, the magnifying power may be calculated from the ratio of the focal lengths of the objective (or primary mirror) and eyepiece, or from the aperture divided by the diameter of the exit pupil.

magnifying power

[′mag·nə‚fī·iŋ ‚pau̇·ər]
(optics)
The ratio of the tangent of the angle subtended at the eye by an image formed by an optical system, to the tangent of the angle subtended at the eye by the corresponding object at a distance for convenient viewing.
References in classic literature ?
The first, constructed by Herschel, was thirty-six feet in length, and had an object-glass of four feet six inches; it possessed a magnifying power of 6,000.
In the present case, dealing with a projectile nine feet in diameter and fifteen feet long, it became necessary to bring the moon within an apparent distance of five miles at most; and for that purpose to establish a magnifying power of 48,000 times.
I at first thought that it was owing to dust blown from the surrounding mountains of red porphyry; for from the magnifying power of the crystals of snow, the groups of these microscopical plants appeared like coarse particles.
However, black holes are so distant that they span a very small area of the sky, so the EHT group is assembling a telescope that has the highest magnifying power possible from the surface of the earth.
To view the trio, an eyepiece with magnifying power of at least 30 will be required.
Until now, no telescope has had the magnifying power required for this kind of observation.
This "microscopic microscope" operates without lenses but has the magnifying power of a top-quality optical microscope, can be used in the field to analyze blood samples for malaria or check water supplies for giardia and other pathogens, and can be mass-produced for around $10.
The instrument, which has the magnifying power of a top quality lab bench microscope, could be mass produced for just pounds 5, say its creators.
Using a single instrument that combines the magnifying power of a microscope with the chemical-analysis prowess of a mass spectrometer , they can uncover the identities and cellular locations of elements such as calcium, boron and magnesium.
To embed the whole telescope inside the spectacle lens they had to obtain the magnifying power from curved mirrors instead of lenses, as mirrors maintain their power when embedded inside the spectacle lens, while the lenses lose their power when not in the air.
Although similar in resolution and magnifying power to a conventional top-quality optical microscope, the optofluidic chip is only the size of a quarter, and the entire device--imaging screen and all--will be about the size of an iPod.
The special Long Work Distance (LWD) lens with magnifying powers of x4, x10, x20 and x40 can be used to observe the particle shapes over an extensive range from 1 to 300 [micro]m, with enhanced contrast, clarity and luminosity.