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.
Within a few months, he was able to duplicate and improve it, increasing its magnifying power from three to about twenty--a feat no one else could perform for a few years.
By knowing this distance, your optometrist can give you the exact magnifying power to see your pins clearly.
20), Hakim Atek (Federal Polytechnic School of Lausanne, Switzerland) and colleagues went hunting for early, faint galaxies using the gravitational magnifying power of three massive galaxy clusters.
But there is more; it also provides the macro lens with additional magnifying power (on top of what the macro lens has).
If a person has a difference in prescription between the two eyes, then at most only one eye will be optimally corrected by these generic reading glasses, which have identical focusing or magnifying power for each eye," says Dr.
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.