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OpenStudy (anonymous):
A mirror is 4 inches in diameter with a focal ratio of f/8. What is the focal length of the mirror in feet?
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OpenStudy (anonymous):
Okay, so 4 inches = 0.375 feet.
OpenStudy (anonymous):
And the equation used to determine focal length is 1/f = 1/do + 1/di where do is the object distance and di is the image distance.
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