A camera has a lens of focal length 50 mm and an f-number of 4.0.What is the diameter of the lens?
A) 50 mm
B) 100 mm
C) 25 mm
D) 13 mm

Name: A camera has a lens of focal length 50 mm and an f-number of 4.0.What is the diameter of the lens? A) 50 mm B) 100 mm C) 25 mm D) 13 mm
Brand: Quizplus
Rating: 4.8 (28 reviews)

Question

Quizplus · Accepted Answer

The f-number (f-stop) is defined as the focal length divided by the diameter of the lens. Therefore, the diameter of the lens is the focal length (50 mm) divided by the f-number (4.0), which equals 12.5 mm, rounded to 13 mm.

A Camera Has a Lens of Focal Length 50 Mm