equiconcave

English

Etymology

From equi- +‎ concave.

Adjective

equiconcave (comparative more equiconcave, superlative most equiconcave)

1. (optics, of a lens) Having surfaces with the same concave radius of curvature.
   • 1901, William Benjamin Carpenter, William Henry Dallinger, The Microscope and Its Revelations, page 22:

     In an equiconcave lens the foci are virtual and are crossed over; thus, the lens in fig. 25A is equiconcave, the focus F, instead of being measured from A to the right hand, must be measured to the left hand; consequently, § of the thickness must be subtracted from the focal length in order to determine the distance of F from the surface of the lens.

   • 2022 October 4, Samantha Strong, Introduction to Visual Optics, Elsevier Health Sciences, →ISBN, page 202:

     In an equiconcave lens, the back surface would have a positive radius of curvature.

   • 2024, YCT Expert Team, Physics Unsolved Papers, Youth Competition Times, page 215:

     A thin equiconvex lens of radius of curvature R made of material of refractive index μ₁ is kept coaxially, in contact with an equiconcave lens of the same radius of curvature and refractive index μ₂ (> μ₁).

Translations

Translations

• Italian: equiconcavo
• Spanish: equicóncavo

See also

• equiconvex

Italian

Adjective

equiconcave

1. feminine plural of equiconcavo