Noun1.principal axis- a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly" optic axis ...
The meaning of PRINCIPAL POINT is either of two points on the principal axis of a lens where the object and image have the same size and are not inverted in relation to each other.
解析 Principal focus is the point on the principal axis through which rays which were parallel to the principal axis pass after refraction by the lens Allow suitable labelled diagram Power is reciprocal of focal length measured in m Allow 1/fmeasured in m ...
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A point object O moves from the principal axis of a converging lens in... 01:26 A point object O is placed at a distance of 20 cm from a convex lens o... 04:18 A point source of light is placed on the principal axis between F and ... 02:19 A man wants to photograph a whi...
Given: A point object O is placed on the principal axis of a convex lens of focal length f=20cm at a distance of 40cm to the left of it. The diameter of the lens is 10cm. An eye is placed 60cm to right of the lens and a distance h below the principal axis. To find...
Two planes perpendicular to the optical axis such that objects in one plane form images in the other with a lateral magnification of unity. The vertical plane passing through the internal perspective center and containing the perpendicular from that center to the plane of a tilted photograph. ...
摘要: Background,Motivation trod Objective Sidelobe contribution from off-axis scatterers degrades image quality in ultrasound imaging.Focusing errors resulting from sound-velocity inhomogeneities in tissues,also known as phase aberrations,reduce coherence of the...
According to the mine elevator winch principal axis radial deflection detection method and the monitoring device, the radial deflection of the winch principal axis can be monitored in real time; the radial deflection and the deflection direction of the winch principal axis are displayed through the ...