# Opticorum recensio Theonis β΄.

Euclid, Opticorum recensio Theonis, β΄.. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/euclid/opticorum-recensio-theonis/%CE%B2%CE%84.

Τῶν ἵσων μεγεθῶν ἐν διαστήματι κειμένων τὰ ἔγγιον κείμενα ἀκριβέστερον ὁρᾶται. ἔστω ὄμμα μὲν τὸ Β, ὁρώμενον δὲ τὸ Γ∠ καὶ τὸ Κ Λ· χρὴ δὲ νοεῖν αὐτὰ ἴσα καὶ παράλληλα, ἔγγιον δὲ ἔστω τὸ Γ∠· καὶ προσπιπτέτωσαν ὄψεις ὡς αἱ Β Β∠, Β Κ, ΒΛ. οὐ γὰρ ἄν εἴποιμεν, ὡς αἱ ἀπὸ τοῦ Β ὄμματος πρὸς τὸ Κ Λ προσπίπτουσαι ὄψεις διὰ τῶν Γ, ∠ σημείων ἐλεύσονται. ἢ γὰρ ἂν τριγώνου τοῦ Β∠ΛΚΒ ἡ Κ Λ μείζων ἄν ἦν τῆς Γ∠· ὑπόκειται δὲ καὶ ἴση. οὐκοῦν τὸ ὑπὸ πλειόνων ὄψεων ὁρᾶται ἤπερ τὸ Κ Λ. ἀκριβέστερον ἄρα φανήσεται τὸ Γ∠ τοῦ ΚΛ.

---

Euclid, Opticorum recensio Theonis, ed. Johan Ludvig Heiberg, Heinrich Menge. Text: The Greek Library, from the Perseus Digital Library and other open sources, CC BY-SA 4.0. Changes: apostrophes normalised and the text divided into reading sections by Interlinea.
License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). Source: https://thegreeklibrary.pages.lisn.upsaclay.fr/works/tlg1799.tlg010.local001/.