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Hubble Space Telescope - the resolving power

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The Hubble Space Telescope (HST) orbits Earth at an altitude of 613 km. It has an objective mirror that is 2.4 m in diameter. If the HST were to look down on Earth's surface (rather than up at the stars), what is the minimum separation of two objects that could be resolved using 550 nm light? [Note: The HST is used only for astronomical work, but a classified number of similar telescopes are in orbit for spy purposes.]

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The angular resolution of a telecope can be calculated using R = L/D where L is the wavelength of the observed radiation and D is the diameter of the ...

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