Plano-Concave is a 13 letter English word.
You can make 468 anagrams from letters in plano-concave (-aaccelnnoopv).
First recorded in 1685-95; plano-1 + concave
The chromatic combination consists of a convex lens of crown backed by a concave, or plano-concave, lens of flint.
The achromatic lens consists of a double convex lens of crown glass combined with a plano-concave lens of flint glass.
If one of the radii becomes infinite, the lens is plano-concave (fig. 9, 5).
plano-concave and double concave lenses produced similar effects.
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