The focal length of a camera lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
A) 0.25
B) 4.0
C) 0.40
D) 2.0
E) 5.6

Name: The focal length of a camera lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens? A) 0.25 B) 4.0 C) 0.40 D) 2.0 E) 5.6
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Question

Quizplus · Accepted Answer

The f-number of a lens is calculated by dividing the focal length by the aperture diameter. So, for a focal length of 40 mm and an aperture diameter of 10 mm, the f-number = 40 mm / 10 mm = 4.0.

The Focal Length of a Camera Lens Is 40 Mm