A principle stating that a ray of light follows the path that requires the least time to travel from one point to another, including reflections and refractions that may occur. Synonym least-time principle. [ From Weik '89 ]
FERMAT'S PRINCIPLE
Meaning of FERMAT'S PRINCIPLE in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012