Dioptrica nova, A treatise of dioptricks in two parts : wherein the various effects and appearances of spherick glasses, both convex and concave, single and combined, in telescopes and microscopes, together with their usefulness in many concerns of humane life, are explained / by William Molyneux of Dublin, Esq. ...
About this Item
Title
Dioptrica nova, A treatise of dioptricks in two parts : wherein the various effects and appearances of spherick glasses, both convex and concave, single and combined, in telescopes and microscopes, together with their usefulness in many concerns of humane life, are explained / by William Molyneux of Dublin, Esq. ...
Author
Molyneux, William, 1656-1698.
Publication
London :: Printed for Benj. Tooke,
1692.
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Subject terms
Optics -- Early works to 1800.
Refraction -- Early works to 1800.
Cite this Item
"Dioptrica nova, A treatise of dioptricks in two parts : wherein the various effects and appearances of spherick glasses, both convex and concave, single and combined, in telescopes and microscopes, together with their usefulness in many concerns of humane life, are explained / by William Molyneux of Dublin, Esq. ..." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A51133.0001.001. University of Michigan Library Digital Collections. Accessed May 3, 2024.
Pages
PROP. XLVII.
The further the Eye is removed from the Concave Glass, the Ob∣ject
appears the less. Zahn Telescop: Fund. 2. Synt. 2.
Cap. 5. Prop. XXIII. Dechales Dioptr. Lib. 2. Prop. LII.
This is manifest from Tab. 32. f. 5. For we are to Consider
the Image d e f, in the virtual Focus, as the Object, and as
look'd at without the Glass. For the Lines d o, f o, which de∣termine
the Optick Angle, are drawn directly to the Eye at o.
Wherefore if we conceive the Eye o removed farther from the
Glass; the Angle d o f must needs decrease, and consequently the
Object appear less. What is here said of the Concave may be ap∣ply'd
to the Convex in Tab. 31. f. 3.