(1):
(a.) Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. See Illust. under Lens.
(2):
(a.) Concave on one side and convex on the other, as an eggshell or a crescent.
(1):
(a.) Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. See Illust. under Lens.
(2):
(a.) Concave on one side and convex on the other, as an eggshell or a crescent.
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