Given the following values, calculate the focal length of the camera lens. - Distance of the camera to the object is 5 m - Vertical field of view is 2 m - Horizontal field of view 1 m

The correct answer is C. 10 meters. Using the standard camera lens focal length formula applied in physical security and CCTV contexts: Focal Length = (Distance × Vertical FOV) / Horizontal FOV. Substituting the values: f = (5m × 2m) / 1m = 10m. This formula is derived from the similar-triangles relationship betwee

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Question

Given the following values, calculate the focal length of the camera lens.

Distance of the camera to the object is 5 m
Vertical field of view is 2 m
Horizontal field of view 1 m

Options

A1 meter
B5 meters
C10 meters
D50 meters
E100 meters

How the community answered

(26 responses)

B
4% (1)
C
69% (18)
D
19% (5)
E
8% (2)

Explanation

Using the standard camera lens focal length formula applied in physical security and CCTV contexts: Focal Length = (Distance × Vertical FOV) / Horizontal FOV. Substituting the values: f = (5m × 2m) / 1m = 10m. This formula is derived from the similar-triangles relationship between the camera's sensor dimensions and the scene dimensions at a given distance. The vertical and horizontal field-of-view values represent the coverage area dimensions, and their ratio scaled by the object distance yields the effective focal length. Answer C (10 meters) is the only value consistent with this calculation.

Topics

#CCTV#camera lens#focal length#field of view

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