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mikael mikael
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9 years ago
A lens of focal length  80 mm is mounted on a 35 mm camera. The lens aperture is set at f/ 5.6 and the shutter speed set at 1/2000s. The aperture diameter, in mm, is closest to: 
A) 14 
B) 10 
C) 12 
D) 16 
E) 19 
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padrepadre
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9 years ago
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