A Small Refracting "Spyglass" Telescope Has an Objective Lens with a Diameter

question 47

Multiple Choice

A small refracting "spyglass" telescope has an objective lens with a diameter of 2 inches. The world's largest refracting telescope at Yerkes Observatory has an objective lens with a diameter of 40 inches. Assuming that all light striking the objective lenses passes through them, how much larger is the light-gathering power of Yerkes than the spyglass?

• A) twice
• B) 40 times
• C) 80 times
• D) 400 times

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