Actually, the mask and openings are not really necessary; the mirror alone could serve as aperture . 其实，挡光板及其上的开孔都是不必要的；单单反射镜本身就可以起小孔的作用。
Note as well that the above considerations apply when all of the apertures are illuminated completely coherently . 还要注意，当所有的孔都以完全相干的方式照明时，上述讨论也适用。
The coddington is essentially a sphere with a slot cut in it to allow an aperture smaller than the pupil of the eye . 科丁顿放大镜实质上是一个球，球面上开槽，使得孔径小于眼的瞳孔。
As sedimentation continues the deposits adjacent to the aperture will build up, layer by layer, to the water level . 当沉积作用连续进行时，邻近口子的沉积将一层一层地向上筑造到水面。
A very small lens aperture is employed to correct spherical aberration, but this severely limits the final resolution . 可以用一个非常小的透镜孔阑来校正球差，但这会严重地影响最终鉴别率。
The results from the pollen densitometers indicate the number of pollen grains sucked into a device per square millimeter of the aperture . 花粉显像密度计的计算结果，可以表明每一平方毫米孔径上吸入的花粉粒数。
In practice the surfaces of interferometer plates cannot be worked perfectly plane, and in consequence the plate separation h always varies over the aperture . 实际上，干涉仪两板表面不可能加工得完全平，因而板的间隔h在孔径范围内总是改变的。
Radio astronomers are now able to synthesize the response of a partially filled aperture of large diameter and thus to map variations in nebular brightness . 射电天文学家现在已经能够把部分充满的大直径孔径进行综合，从而描绘出星云亮度变化图。
This setup, known as a conoscope, is shown in figure 14. 2 and consists of two stress-free plane-convex lenses a and b and a diaphragm c having a small aperture . 此装置称为锥光镜，如图142所示，它由A和B两个无应力平凸透镜和一个带小孔的光阑C组成。
