Many Amateur Astronomers Have Telescopes with Mirrors 20 Cm (1/5

question 102

Multiple Choice

Many amateur astronomers have telescopes with mirrors 20 cm (1/5 m) in diameter. In comparison, one of the largest astronomical telescopes in the world is the Keck telescope, with a diameter of 10 m. How much greater is the light-gathering power of the Keck telescope than the power of a 20-cm telescope?

• A) 50 times greater
• B) 7 times greater
• C) 125,000 times greater
• D) 2500 times greater

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