A Camera Is Used to Photograph the Full Moon,which Has

question 10

Multiple Choice

A camera is used to photograph the full moon,which has an angular diameter of 0.51°.The image on the film is 2.5 mm in diameter.What is the focal length of the lens?

• A) 6.3 mm
• B) 280 mm
• C) 13 mm
• D) 450 mm

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