nodal points

A ray of light traveling in the direction of the front nodal point will be refracted by the lens such that, when it emerges on the other side and refracted again, it will appear to be coming from the back nodal point.

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Geometrical Construction of Ray Diagrams

A popular method of representing a train of propagating light waves involves the application of geometrical optics to determine the size and location of images formed by a lens or multi-lens system. This tutorial explores how two representative light rays can establish the parameters of an imaging scenario.