Oznaczający (Angielski)

Koncepcje

ognisko

koncentrować

ognisko optyczne

skupić

ogniskować

fokus

ostrość

Częstotliwość

B1
Wymawiane jako (IPA)
/ˈfəʊ.kəs/
Etymologia (Angielski)

Borrowed from Latin focus (“hearth, fireplace”); see there for more. Doublet of fuel. Kepler introduced the term into mathematics and the sciences in describing elliptical orbits of planets (quote from Nicholas Mee) : "One of the interesting properties of an ellipse is that if there were a light bulb at one focus, then all the light that it emits would reflect off the ellipse and converge at the other focus. This is why Kepler originally used the name focus for these points."

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