The cathetus rule equals the assumption of a stigmatic image with well-defined cathetus, holds approximately in paraxial optics, and lets sagittal image points be located on the chief ray alone for leading-order astigmatism assessment.
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physics.hist-ph 1years
2026 1verdicts
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The unreasonable effectiveness of the cathetus rule in ancient and modern optics
The cathetus rule equals the assumption of a stigmatic image with well-defined cathetus, holds approximately in paraxial optics, and lets sagittal image points be located on the chief ray alone for leading-order astigmatism assessment.