pseudo-rayn.

Brit.

/ˈs(j)uːdə(ʊ)reɪ/, U.S.

/ˈsudoʊˌreɪ/

Origin: Formed within English, by compounding. Etymons: pseudo- comb. form, ray n.⁵

Etymology: < pseudo- comb. form + ray n.⁵

†1. Geometry. A geodesic in a non-Euclidean space or a space of more than three dimensions analogous to a ray or straight line in two- or three-dimensional Euclidean space. Obsolete. rare.Apparently only attested in dictionaries or glossaries.

ΚΠ

1890 Cent. Dict. Pseudo-ray, a straight line or ray in non-Euclidean geometry.

2. Optics. A ray with abnormal properties that arises in the course of certain calculations; spec. one that does not obey Snell's law of refraction.

ΚΠ

1963 Proc. Royal Soc. A. 276 371 (caption) For X on the concave (dark) side ZY₀X gives a pseudo ray corresponding to the travel time of a diffused pulse.

1985 K. G. Budden Propagation Radio Waves xiv. 422 These rays cannot obey Snell's law..because n is complex. They will therefore be called ‘pseudo rays’.

1998 Optics & Lasers Engin. 29 325 We justify the expediency of the employment of pseudo-rays in the course of designing optical systems including radially-gradient and diffractive lenses.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	pseudo-ray
释义	pseudo-rayn. Brit. /ˈs(j)uːdə(ʊ)reɪ/, U.S. /ˈsudoʊˌreɪ/ Origin: Formed within English, by compounding. Etymons: pseudo- comb. form, ray n.⁵ Etymology: < pseudo- comb. form + ray n.⁵ †1. Geometry. A geodesic in a non-Euclidean space or a space of more than three dimensions analogous to a ray or straight line in two- or three-dimensional Euclidean space. Obsolete. rare.Apparently only attested in dictionaries or glossaries. ΚΠ 1890 Cent. Dict. Pseudo-ray, a straight line or ray in non-Euclidean geometry. 2. Optics. A ray with abnormal properties that arises in the course of certain calculations; spec. one that does not obey Snell's law of refraction. ΚΠ 1963 Proc. Royal Soc. A. 276 371 (caption) For X on the concave (dark) side ZY₀X gives a pseudo ray corresponding to the travel time of a diffused pulse. 1985 K. G. Budden Propagation Radio Waves xiv. 422 These rays cannot obey Snell's law..because n is complex. They will therefore be called ‘pseudo rays’. 1998 Optics & Lasers Engin. 29 325 We justify the expediency of the employment of pseudo-rays in the course of designing optical systems including radially-gradient and diffractive lenses. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1890
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