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'''urn:mrn:iala:dic:2-2-0025''' | |||
'''2-2- | |||
A transparent optical element, usually of glass or plastic, in the form of an annulus or annular segment, having a prismatic section in sense 2 of 2-2-020. There are both dioptric (2-2-060) and catadioptric (2-2-070) rings, usually forming part of an optical panel or a drum lens. | A transparent optical element, usually of glass or plastic, in the form of an annulus or annular segment, having a prismatic section in sense 2 of 2-2-020. There are both dioptric (2-2-060) and catadioptric (2-2-070) rings, usually forming part of an optical panel or a drum lens. | ||
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(Figs. 10 and 16) | (Figs. 10 and 16) | ||
[[Image:Ch2_Fig10.jpg|400px]] | [[Image:Ch2_Fig10.jpg|400px|border]] | ||
[[Image: | [[Image:Ch2_Fig16a.jpg|400px|border]] | ||
[[Image:Ch2_Fig16b.jpg|400px|border]] | |||
{{IALAFooter}} | {{IALAFooter}} | ||
Latest revision as of 09:45, 17 September 2026
A transparent optical element, usually of glass or plastic, in the form of an annulus or annular segment, having a prismatic section in sense 2 of 2-2-020. There are both dioptric (2-2-060) and catadioptric (2-2-070) rings, usually forming part of an optical panel or a drum lens.
(Figs. 10 and 16)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
