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Article | REF: AF3714 V1

Invisibility. Transformation of space and applications

Author: André de LUSTRAC

Publication date: July 10, 2010, Review date: April 26, 2021

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1. Space transformation

1.1 Principle

In a letter from 1662, Pierre de Fermat laid down the principle that governs all geometrical optics . Light follows a stationary optical path between two points. Most of the time, it follows the shortest path. In some cases, it takes the longest path. This optical path is defined by the relation (1) , where n is the refractive index, which may depend on spatial coordinates, and

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