What, Approximately, Are the Dimensions of the Smallest Object on Earth

question 39

Multiple Choice

What, approximately, are the dimensions of the smallest object on Earth that the astronauts can resolve by eye at 200 km height from the space shuttle? Assume λ = 500 nm light and a pupil diameter D = 0.50 cm. Assume eye fluid has an average n = 1.33.

• A) 150 m
• B) 100 m
• C) 250 m
• D) 25 m
• E) 18 m

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Definitions:

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A major component of the brain in humans and other vertebrates, involved in memory formation and spatial navigation.

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