Bošković, Ruđer Josip, Abhandlung von den verbesserten dioptrischen Fernröhren aus den Sammlungen des Instituts zu Bologna sammt einem Anhange des Uebersetzers

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page |< < (99) of 199 > >|
10399Von verbeß. Fernröhren.
{1/a} = {1/a′} - m′ a ({1/a′2} - {1/q′2})
{1/b} = {1/b′} - m′ a ({1/b′2} - {1/q′2})
{1/f} = {1/a} + {1/b}
m - 1 = {f/u} - {m′ a f/q′2} = ({1/u} - {m′ a/q′2}): {1/f}.
137. Dieſes weiſet ſich aus der Formel
(55):
ſetzen wir, daß die Brennweite für
Straalen
, die aus einem Punkte ansfahren,
und
unendlich nahe bey der Achſe einfallen,
z
ſey, ſo wird z = r - {r2 m a/q2}, mithin
1

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