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Telescope Light-Gathering Power

The light-gathering power of an optical telescope, also referred to as light grasp or aperture gain, is the ability of a telescope to collect a lot more light than the human eye.

The light\[Hyphen]gathering power ratio equals the square of the ratio of the objective diameters of the two telescopes or other viewing apparatuses.

Formula

QuantityVariable[Subscript["LGP", "1"]/Subscript["LGP", "2"], "Unitless"] == QuantityVariable[Subscript["D", "1"], "Diameter"]^2/QuantityVariable[Subscript["D", "2"], "Diameter"]^2

symbol description physical quantity
LGP1/LGP2 light­gathering power ratio "Unitless"
D1 objective diameter 1 "Diameter"
D2 objective diameter 2 "Diameter"

Forms

Examples

Get the resource:

In[1]:=
ResourceObject["Telescope Light-Gathering Power"]
Out[1]=

Get the formula:

In[2]:=
FormulaData[ResourceObject["Telescope Light-Gathering Power"]]
Out[2]=

Use some values:

In[3]:=
FormulaData[ ResourceObject[ "Telescope Light-Gathering Power"], {QuantityVariable[ \!\(\*SubscriptBox[\("D"\), \("2"\)]\),"Diameter"] -> Quantity[8, "Inches"], QuantityVariable[ \!\(\*SubscriptBox[\("LGP"\), \("1"\)]\)/ \!\(\*SubscriptBox[\("LGP"\), \("2"\)]\),"Unitless"] -> 4}]
Out[3]=

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