Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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page |< < ((36)) of 824 > >|
583(36)PHYSICES ELEMENTA refractionis G np; id eſt, radii refracti magis divergentes
fiunt, &
ad C accedit focus imaginarius f ; donec 11646. puncti radiantis tandem hoc coincidat cum foco imaginario
in C;
in hoc enim caſu radii nullam patiuntur refractionem .
22629.
Si ulterius accedat punctum radians, inter C & O ma-
33676. gis diſtet focus imaginarius ab O, quàm punctum radians, in-
ter hoc enim &
C ſemper ille datur, propter angulos refra-
ctionis minores angulis incidentiæ .
44624.
Experimentum. 7.
Si eadem dentur, quæ in experimento præcedenti, ad-
hibitâ tabellâ cum lente convexâ, de qua ſæpius jam di-
ctum, ad punctum radians formandum, facilia ſunt experi-
menta circa has propoſitiones.
Si radii fuerint convergentes, & punctum concurſus detur
55677. in medio denſiori, in viciniis ſuperficiei media ſeparantis, re-
fracti radii etiam convergunt, ſed minus convergunt, quàm
incidentes.
Si ab O magis ac magis recedat focus imaginarius radio-
rum incidentium, id eſt, ſi hi minus convergant, etiam mi-
66678. nus convergent radii refracti;
donec, receſſu foci imagina-
rii, refracti paralleli ſint.
In ulteriori receſſu foci imaginarii divergentes fiunt refra-
77679. cti radii.
Experimentum 8.
In hoc ad pixidem ita admovenda eſt tabella T, ut ra-
88TAB. VII.
fig 5.
dii convergentes aquam intrent;
& in motu tabellæ prædi-
cta ad oculum patent.
Radii, qui e medio denſiori in rarius penetrant, manente
99680. ſuperficie cavâ ad partem hujus medii, iiſdem fere legibus
ſubjiciuntur.
Radii paralleli refractione divergunt .
1010678. 626.
Si à puncto radianti procedant, magis ſunt divergentes .
1111681.1212677.
Et cum acceſſu puncti radiantis continuo magis ac magïs
1313682. divergunt .
1414678.
Convergentes radii, qui ad centrum ſuperficiei ſphæricæ
1515683. tendunt, nullam ſubeunt mutationem .
1616629.
Si magis aut minus convergant, focus imaginarius inciden-
1717684.

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