Parallel beam

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Course of the focal point beam and parallel beam in a collecting optical system (lens)

The parallel beam is a construction aid for the beam path of an optical system.

Starting from the object point O to be imaged, it runs parallel to the optical axis to the main plane of the optical system on the image side , and from there as a focal point beam on the image side (i.e. a beam passing through the image-side focal point ) to the image plane, where it intersects both the center beam and the parallel beam on the image side which start from the same object point in object space. This point of intersection is thus the image point O '.

If the system is dispersive, such as B. a single diverging lens , the parallel beam is refracted so that the rearwardly elongated image-side beam passes through the image-side focal point.