The distance between the rear nodal point of the lens and the focal plane.

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Multiple Choice

The distance between the rear nodal point of the lens and the focal plane.

The distance is the focal length. In lens geometry, the rear nodal point serves as the reference point for rays entering the lens, and the focal plane is located one focal length behind that point. So the fixed separation between the rear nodal point and the focal plane is by definition the focal length. Describing the lens as having a short or long focal length speaks to the lens’ property, not this specific distance, and a topographic map is unrelated.

The distance is the focal length. In lens geometry, the rear nodal point serves as the reference point for rays entering the lens, and the focal plane is located one focal length behind that point. So the fixed separation between the rear nodal point and the focal plane is by definition the focal length. Describing the lens as having a short or long focal length speaks to the lens’ property, not this specific distance, and a topographic map is unrelated.

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