Lecture07 - Adaptive optics coordinate systems...

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Adaptive optics, coordinate systems
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Angular Resolution A fundamental limit on how fine the detail a telescope can resolve is its “diffraction limit”. The resolution of a telescope is given by: High resolution (small number) is better, as it allows more closely spaced features to be distinguished.
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Other examples of resolution Angular units are given as degrees, arc minutes, arc seconds, or even better as radians. An arcsec is about the angular size of a quarter seen 5 km away. The resolution of your eye is about 1 arc minute. So, for green light ( λ = 500 nm), the resolution of a telescope with a diameter of 10m is 0.01 arcsec. Because of limitations caused by the Earth’s atmosphere, telescopes larger than that only gain you light gathering power, unless you do something to reduce the blurring by the atmosphere. Radio telescopes, which operate at wavelengths 10,000 times longer, will have far worse resolution. EXCEPT… arcsec
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The Mighty Keck What happens to the image when you start removing tiles from the mirror?
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The Mighty Keck
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Lecture07 - Adaptive optics coordinate systems...

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