The Focal Length of a Thin Lens Is 40 Mm

question 58

Multiple Choice

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) f/4.0
• B) f/2.0
• C) f/5.6
• D) f/0.30
• E) f/0.40

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