Principal ray

(Persp.)

the line drawn through the point of sight perpendicular to the perspective plane.

principal ray

[′prin·sə·pəl ′rā] (optics) The one ray within a bundle of incident rays that, upon entering an optical instrument from any given point of the object, passes through the optical center of the lens. principal visual ray

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assistant to the secretary of defence for intelligence oversight
assistant to the secretary of defense
assistant to the secretary of defense - civil support
assistant to the secretary of defense for homeland defense and americas' security affairs
assistant to the secretary of defense for intelligence oversight
assistant to the secretary of defense for nuclear & chemical & biological defense programs
assistant township education officer
assistant trainmaster
assistant under secretary of state
assistant united states attorney
assistant unit operator
assistant vice chief of naval operations
assistant vice chief of staff, army
assistant vice president
assistant weapons officer
assistant webmaster/special operations manager
assistant with a view
assist at
assist citizen
assist control
assist-control mechanical ventilation
assist-control mode
assist/control mode ventilation
assist-control ventilation
assisted

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