Abstract

<p>The National Bureau of Standards has been making optical calculations for well over a year, using both their new high-speed SEAC and the commercially available IBM Card Programmed Electronic Calculator.</p><p>Formulas especially suitable for machine computation are presented here. These enable a general ray to be traced through a rotationally symmetrical system of spherical or nonspherical surfaces. Formulas are also given for computing first- and third-order coefficients for any centered optical system.</p><p>The formulas are derived from well-known forms, but they are transformed so that none of the quantities used in the machine ever becomes indeterminate or infinite. The formulas for first- and third-order coefficients are simpler than those frequently given and are very convenient for hand calculation.</p>

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