The conclusion has been spread to spherical lens retroreflection array. The basic idea of the spherical lens retroreflector and its key points of application have been proposed.

并把此结论推广到球透镜逆反射阵列，提出球透镜逆反射器的基本概念及应用的要点。

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Instead of converging to a point on a focal plane behind the lens, the rays spread out so as to run in a thick stream roughly parallel to each other (see chart).

ECONOMIST: MONITOR