| 单词 | herschel condition |
| 释义 | > as lemmasHerschel condition Herschel condition n. (also Herschel's condition) a condition that must be satisfied by a system of lenses if spherical aberration is to be absent in the images of two neighbouring objects. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > refraction > [noun] > law or condition Snell's law1873 Herschel condition1910 1910 J. P. C. Southall Princ. & Methods Geom. Optics xii. 394 It has..been suggested that the other requirement should be the so-called Herschel-Condition; that is, that the function ϕ1Z1 + ϕ2Z2 should vanish not only for the particular value of x1 but also for object-points on the axis very near to the point M1 to which the value x1 belongs. 1932 A. C. Hardy & F. H. Perrin Princ. Optics vi. 98 The condition that n sin 1/ 2θ/n′ sin 1/ 2θ′ = a constant must be satisfied for all values of θ. This is commonly called the Herschel condition although it had not been formulated mathematically when Herschel constructed his objective. 1957 R. S. Longhurst Geom. & Physical Optics xiv. 280 Herschel's condition is the condition that must be satisfied if the system is to form, simultaneously, a good image of a neighbouring axial object point. < as lemmas |
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