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Figure 5


Fig. 5. Facet lens lattice with numbers, where the facets are classified according to their distance from the central facet, number 1. The facets 1, 2, 4, 6, 9, etc. are the facets of adjacent ommatidia in a meridional section (indicated by arrows). Rays parallel to the central ray (the ray through the vertex of facet 1) that travel through equal-numbered facets have the same optical path length difference with the central ray.