LIGHT-GATHERING POWER
One reason for using a larger telescope is simply that it has a greater collecting area"the total area of a telescope capable of capturing radiation.
Light-Gathering Power = p×(diameter of objective)2/4.
Resolving Power = 252,000×(observation wavelength/diameter of objective). Better resolving power has smaller .
Magnifying Power = (objective focal length) / (eyepiece focal length).
light-gathering power
the ability of a telescope to collect light; the larger a telescope's aperture, the greater its light-gathering power
light-year ...
light-gathering power: The ability of a telescope to collect light; proportional to the area of the telescope objective lens or mirror.
Light-Gathering Power - A number, proportional to the area of the principal lens or mirror of a telescope, that describes the amount of light that is collected and focused by the telescope ...
light-gathering power - (n.)
The ability of a telescope to collect light from an astronomical source. The light-gathering power is directly related to the area of the primary mirror or lens.
light-harvesting pigment - (n.) ...
In terms of light-gathering power, objective diameter is not the only important parameter. Lens (and prism) coatings are just as important. Each time light enters or leaves a piece of glass, about 5% is reflected back.
The closed tube stays clean, and the primary is protected, at the cost of some loss of light-gathering power.
Ritchey-Chrétien ...
The area of a telescope's primary light-collecting mirror. A telescope's light-gathering power rises with an increase in its collecting area.
Colliding Galaxies ...
Newton placed a small plane mirror at an angle of 45 inside the prime focus and thereby brought the focus to the side of the telescope tube. The amount of light lost by this procedure is very small when compared to the total light-gathering power of ...
 See also: Light, Telescope, Distance, Time, Earth
  
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