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.