Where is the "rear nodal point"? Well it could be anywhere. It could be somewhere inside the lens, ...
Short rotation is a term used to define cameras that have a lens that rotates around the camera's rear nodal point (the optical point from which the focal length is measured) opposite a curved film plane.
The distance between the rear nodal point of the lens and the focal plane, when the focus is set at infinity.
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-Focal length - distance between the rear nodal point of the lens and the focal plane, when the focus is at infinity.
The front nodal point is where rays of light entering the lens appear to aim. The rear nodal point is where the rays of light appear to have come from, after passing through the lens. Nodal points are used to calculate optical measurements.
This is expressed in millimeters and represents the field of view of a camera lens. It is the distance between the focal plane and the rear nodal point of the lens, at infinity focus. For example, a 50mm lens has a wider view than a 100mm lens.
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The technical description of focal lengths is rooted in the mathematics of optics - it's the distance between the focal plane and the rear nodal point of the lens, given infinity focus.
 See also: Lens, Nodal point, Light, Focal length, Focus
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