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# exc1 - Introduction to Astrophysics 0321.3108 Exercise 1 1...

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Introduction to Astrophysics 0321.3108 Exercise 1 1. a. Calculate the best angular resolution that can, in principle, be achieved with the human eye. Assume a pupil diameter of 0.5 cm and the wavelength of green light, 0 . 5 μ m. Express your answer in arcminutes, where an arcminute is 1 / 60 of a degree. (In practice, the human eye does not achieve diffraction limited performance, because of imperfections in the eye’s optics and the coarse sampling of the retina by the light-sensitive “rod” and “cone” cells that line it.) b. What is the angular resolution, in arcseconds (1 / 3600 of a degree), of the Hubble Space Telescope (with an aperture diameter of 2.4 m) at a wavelength of 0 . 5 μ m? c. What is the angular resolution, expressed as a fraction of an arcsecond, of the Very Long Baseline Interferometer (VLBI)? VLBI is an network of radio telescopes (wavelengths gg 1100 cm), spread over the globe, that combine their signals to form one large inter- ferometer.

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