| 单词 | point of reflection |
| 释义 | > as lemmaspoint of reflection point of reflection n. a point at which something returns or reverses its path; spec. (a) Optics a point at which a ray is reflected; †(b) Geometry = cusp n. 4; cf. point of retrogression n. at Phrases 4k (obsolete). ΘΚΠ the world > relative properties > number > geometry > point > [noun] > of intersection or contact > of specific lines or curves cuspis1646 focus1656 point of reflection1674 umbilicus1704 cuspid1743 cusp1758 rhamphoid1814 biplanar1849 oscnode1852 tacnode1852 tangential of a point1858 cnicnode1869 uniplane1869 unode1869 1674 J. T. tr. G. Harvey Theoret. & Pract. Treat. Fevors ii. 11 Conceiving, that the pulse is like a reciprocal swelling and falling,..there can only be inferred a point of reflection, namely, as soon as it swells up, the next moment it falls again, and as soon as it's fallen, the next minute of time it swells again. 1704 I. Newton Opticks ii. 85 If any sort of rays falling on the polite surface of any pellucid medium be reflected back, the fits of easy reflexion which they have at the point of reflexion, shall still continue to return. 1758 I. Lyons Treat. Fluxions vii. §191. 142 If a curve instead of being continued beyond the ordinate is reflected from it,..that ordinate is said to pass through a point of Reflection or Cusp. 1782 Philos. Trans. 1781 (Royal Soc.) 71 475 By this method of resolution the point of reflection is found with the greatest exactness. 1860 Philos. Trans. 1859 (Royal Soc.) 149 908 We conceive the point of reflexion of the ray on the mirror of the heliostat to be the centre of a sphere. 1950 Math. Mag. 24 116 In the second type of caustic, the reflected ray can be seen to turn 3/2 times as fast as the radius to the point of reflection. 2004 Proc. SPIE (Internat. Soc. Optical Engin.) 5443 277 The perceived source of the beam is the point of reflection, providing a 120-degree field breadth at each eye. < as lemmas |
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