光学名词解释（Interpretation of optical terms）.doc

光学名词解释（Interpretation of optical terms） Aperture, stop (Kong Jinglan) - the aperture used to restrict the beam size into the optical system. Astigmatism (astigmatism) - a light passing through a lens system from an off-axis point source. The meridional focus is not in the same place as the sagittal focus. Marginal ray (edge beam) - rays emitted by an object at the axis and passing through the edge of the pupil. Chief ray (main beam) by light from the axial object point of oblique incident to the system and through the aperture stop center. Chromatic aberration (color aberration) - the light of different wavelengths has no refractive index in the same medium, so the focal positions on the axis are different, thus causing chromatic aberration. Coma (Hui Cha) - when an off-axis beam is obliquely incident to the lens system, the aberration of the image passing through the aperture edge is different from that of the image passing through the aperture center. Distortion (distortion), which is different from the magnification on the off-axis and axis, is divided into two forms: cylindrical aberration and pincushion distortion. Entrance pupil (incoming pupil) - light emitted from the point at the axis. After the assembly before the aperture stop and the formation of the aperture stop like, i.e. by point axis position to see the aperture stop and the image. Exit pupil (exit pupil) - axis point like light, after the assembly and the formation of the aperture stop behind the aperture stop like that, by looking at the aperture stop like plane axis position and the like. Field curvature (field curvature) - all points on the plane of the object pass through the optical system and form a point in the image space. If the image surface formed by these points is curved surface, the system has a field curve. Field of view (field of view) the maximum object size that can be accepted by an optical system at a certain distance from the angle of the object. F-number (focal number) - the r