Figure 2: This set of figures introduces an abstract form of illustration, which will be used in this
document. The top figure shows a typical example taken from the analysis of an optical system: an
incident field is reflected and transmitted by a semi-transparent mirror; there might be the
possibility of second incident field . The lower left figure shows the abstract form we choose
to represent the same system. The lower right figure depicts how this can be extended to include a
beam splitter object, which connects two optical axes.
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