Prismatic Section: Difference between revisions
Jump to navigation
Jump to search
m (1 revision) |
m (Dictionary clean-up: identifier → urn:mrn:iala:dic:2-2-0020) |
||
| (2 intermediate revisions by one other user not shown) | |||
| Line 1: | Line 1: | ||
'''2-2- | '''urn:mrn:iala:dic:2-2-0020''' | ||
1. Cross-section of a prism by a plane normal to the refracting edge. The section is bounded by straight lines (usually three). | 1. Cross-section of a prism by a plane normal to the refracting edge. The section is bounded by straight lines (usually three). | ||
Latest revision as of 09:33, 17 September 2026
1. Cross-section of a prism by a plane normal to the refracting edge. The section is bounded by straight lines (usually three).
2. In lighthouse practice, the term is also used for a cross-section of a transparent optical element bounded by three straight or slightly curved sides, approximating to a triangle, but of such shape that incident parallel rays of a particular wavelength are focussed after refraction or reflection (or both) by the section.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
