Prionsabal Fermat
Sa bhfisic, tugtar Prionsabal Fermat ar thaisteal gathanna solais idir dhá phointe (mar shampla ón aer, trí phána gloine, le hathraonadh ar an dá thaobh, agus amach san aer ar an taobh eile) ionas go dtógann siad an oiread ama is lú chuige.
Is sampla é seo de phrionsabal an íosghníomhaithe, a léirigh Pierre de Fermat i 1657.
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