Airy disk brilliance (the brightness of a point-source stellar image) is proportional to the fourth power of aperture.
艾里斑的亮度(点光源恒星的图像亮度)正比于孔径尺寸的四次方。
2
Therefore interaction Hamitonian of the single mode light field with the medium is proportional to the fourth power of the annihilation operator plus creation operator.
因此，单模光场与此介质相互作用的哈密顿量正比于光场的湮灭算符与产生算符和的四次方。
3
As is known to all, with the increment of building height, the Lateral displacement is proportional to the height with the fourth power.