The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
A) 4.0
B) 2.0
C) 5.6
D) 0.30
E) 0.40

Name: The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens? A) 4.0 B) 2.0 C) 5.6 D) 0.30 E) 0.40
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Question

Quizplus · Accepted Answer

The f-number (f/#) is calculated by dividing the focal length by the aperture diameter. Here, f/# = 40 mm / 10 mm = 4.0.

The Focal Length of a Thin Lens Is 40 Mm