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neezy neezy
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The pupil of the human eye is approximately 0. 8 centimetres in diameter when adapted to the dark. What is the ratio of the light-gathering power of a 1. 6 metre telescope to that of the human eye?



2 : 1



4 : 1



200 : 1



40,000 : 1

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ASTRO

ASTRO


Edition: 3rd
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richardbuggrichardbugg
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