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Why are radio telescopes typically built so large compared with optical telescopes?
Radio telescopes are much larger than optical telescopes because of wavelength.
Earth's atmosphere has two major "windows" where it is transparent to photons:
300 nm - 800 nm: optical wavelength window (approximate)
30 mm - 30 m: radio wavelength window (approximate)
Even the shortest-wavelengths used by radio telescopes at around 30 mm are still thousands of times longer than the longest wavelengths used by optical telescopes.
The wavelength has 2 effects on the size of a telescope:
* The angular resolution (in order to distinguish 2 nearby stars, FWHM) depends on the wavelength/aperture ratio. Radio-frequency photons require a wider aperture to focus than visible-light-frequency photons, so radio telescopes *must* be larger to get a reasonable resolution.
* A telescope typically requires the collecting area to be aligned within 1/10 of the wavelength it is designed for. Because it is almost impossible to get all the parts of a sufficiently large telescope aligned to within 80 nm, radio telescopes *can* be built much larger.
What else can I help you with?
Why was LA built?
It was built as a Palace for the King.
When was the statue of Francis Drake built?
it was built in 1823
Why did the sumerians built dikes?
because they need to built it to live in it
What is the name of the man who built the tazma hall?
The Taj Mahal was built by Shah Jahan, who was an emperor in India. It was built as a monument to his wife.
What year did violins got built?
It was first built in the 16th century.
What year was the non optical telescope invented?
The non-optical telescope, primarily radio telescopes, were invented in the 1930s. One of the first and most notable radio telescopes was built by Karl Guthe Jansky in 1931.
Why have astronomers built the largest optical telescopes on the top of mountains?
To get above the thickest part of the Earth's atmosphere. The air absorbs light and its movements distort the image.
Why are most modern telescopes reflecting telescopes?
Most modern telescopes are reflecting telescopes because reflecting telescopes are generally more cost-effective and easier to build at larger sizes compared to refracting telescopes. Reflecting telescopes also suffer less from chromatic aberration and can have a simpler design with fewer optical elements.
Who built telescopes?
isac newton and galileo galilei
What are the advantages of ground-based telescopes?
Ground-based telescopes are typically larger and more cost-effective than space telescopes. They can be easily upgraded and repaired, and have the ability to be built in remote locations for better viewing conditions. Additionally, ground-based telescopes benefit from continuous improvements in technology and instrumentation.
Who built and used reflecting telescopes?
Thousands of people still do build their own astronomical telescopes; it isn't that hard to do.
What radiation should astronomers observe if they want to get images twenty four hours a day quickly and cheaply Why?
Astronomers should observe radio waves if they want to capture images twenty-four hours a day quickly and cheaply. Radio waves can penetrate clouds and atmospheric disturbances, allowing for continuous observations regardless of weather conditions or time of day. Additionally, radio telescopes require less complex technology and can be built at a lower cost compared to optical telescopes, making them a practical choice for frequent imaging.
Can Refracting telescopes can be much larger than reflecting telescopes?
In principle, there's no reason why it couldn't be. But it would be prohibitively expensive, harder to operate mechanically, and tough to match the optical performance of an equal-sized reflector. That's why, bowing to pragmatism and practicality, there hasn't been a larger refractor built since the 40-incher at the Yerkes Observatory was completed in 1895.
Why are most large telescopes reflecting telescopes?
They are refracting telescopes(:Large refracting telescopes are no longer built because there were too many problems with them. There was color distortion, light pollution, and when the object hits the focal point it turns upside down. Then you don't see the object for what it really is, you see it upside down and weird-ed out. They are to complicated and scientists believed they should just stick with the simple, small, original refracting telescopes!!!!-Meghan Betts (8th grader)
Which is a built in input device for a notebook?
Optical mouse
Which is NOT a built- in input device for a notebook?
Optical mouse
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.
