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How do four telescopes of diameter 8m each gather as much light as one of diameter 16m?
Wiki User
∙ 16y ago
the surface area of the 8m (201 m^2) telescope is 1/4 that of the 16m (804 m^2) telescope A=(Pi)r^2
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoDouble the diameter, increase the light-gathering power by 4x. It's a proportion by squares; triple the diameter, and you increase the light-gathering power by a factor of nine, or 3 squared.
Wiki User
∙ 13y ago4 times the surface area means 4 times the light-gathering power.
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What is the dameter of each of the twin Keck telescopes?
The telescopes' primary mirrors are 10 meters in diameter.
Why do astronomers use as few lenses as possible in their telescopes?
Each lens absorbs some light, making the telescope weaker. I suppose each lens could also introduce certain abberations.
How much more light gathering power does a 5 meter diameter telescope have as compared to the human eye?
The primary mirrors of each of the two telescopes are 10 meters (33 ft) in diameter. A human eye has a pupil less than 8mm in diameter. The area of a Keck mirror is about 1,6 million times larger than that of the human pupil. (The sensors used are more sensitive too able to detect single photons).
Why are curved mirrors used in some telescopes?
Plane mirrors don't form real images. Concave mirrors and convex lenses do. Without a real image, you have nothing to expose film to, nothing to project onto a screen, nothing to capture on a CCD or vidicon, and nothing to look at with an eyepiece.
When were telescopes used to see Uranus Neptune and Pluto?
All of those objects were discovered by telescope, so it's safe to say that telescopes were used from day one for each.
What is the dameter of each of the twin Keck telescopes?
The telescopes' primary mirrors are 10 meters in diameter.
Do astronomers spend all their time looking through a telescope and recording their results?
Nowadays, the bulk of the work astronomers do is on computers. They spend a small portion of their time at telescopes actually taking data. Astronomically-useful telescopes rarely have eyepieces you can look through. Radio, ultraviolet, or infrared telescopes collect light that you can't even see with your eye! Telescopes that collect visible light often have electronic cameras called CCD cameras that create an image in a computer. Many telescopes are used to create a spectrum (the light is split into a rainbow, and the brightness of each color is measured). Radio telescopes record signals that astronomers can reconstruct using a computer to make an image or a spectrum.
Why do astronomers use as few lenses as possible in their telescopes?
Each lens absorbs some light, making the telescope weaker. I suppose each lens could also introduce certain abberations.
Why do astronomers continue to build even larger telescopes?
Radio telescopes allow us to see things that can't be seen in visible light. And vice versa, optical telescopes can show things that are not visible in radio telescopes. So, the information from both kinds of telescopes really complements each other.
How much more light gathering power does a 5 meter diameter telescope have as compared to the human eye?
The primary mirrors of each of the two telescopes are 10 meters (33 ft) in diameter. A human eye has a pupil less than 8mm in diameter. The area of a Keck mirror is about 1,6 million times larger than that of the human pupil. (The sensors used are more sensitive too able to detect single photons).
What is replacting telescope?
answ2. Telescopes come in two flavours, reflecting and refracting.Reflecting telescopes rely on the light first meeting a mirrored reflector which may be of large area, then passes through various focusing lenses.Refracting telescopes have the light passing through a lens, before meeting the focusing lenses etc.Now, there is a loss of light each time the light passes into or out of a glass, even ignoring imperfections of the surface. And more when that is considered.And it is more than doubly difficult to make a large lens than a large mirror.And since astronomy is mainly limited by the light-gathering power, this is vital to astronomers.A1. Nothing. Any device to see the light of distant stars or other objects would still be called a telescope.
Why are curved mirrors used in some telescopes?
Plane mirrors don't form real images. Concave mirrors and convex lenses do. Without a real image, you have nothing to expose film to, nothing to project onto a screen, nothing to capture on a CCD or vidicon, and nothing to look at with an eyepiece.
How do scientists use spectroscope to gather information about stars?
Scientists can use spectroscopes to gather information because the light from the stars that passes through has a certain color. Each element on the Periodic Table has a specific color. This way, scientist can figure out of which gases the star consists of.
When were telescopes used to see Uranus Neptune and Pluto?
All of those objects were discovered by telescope, so it's safe to say that telescopes were used from day one for each.
Why arent refracting telescopes bigger than reflecting telescopes?
If you are comparing the biggest telescopes in each type, that's because a large refracting telescope needs a huge lens, which gets expensive; also, the lens can't be supported, while a mirror can.
Why do cow's gather around each other for?
reproduction
Why do non optical telescopes work better on earth?
They don't. All earth bound telescopes, optical or not, must deal with a number of issues. But what do you mean by "better"? A radio telescope is better suited to pick up radio waves than an optical telescope, but an optical telescope is better for visible light. They each serve their purpose better than the other.
