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。
In actual practice a brighter image is obtained by using a broad, rather than a point, source along with a substage condenser.
在实际工作中，不是用点光源而是用一个扩展光源加一个台下聚光镜以得到一个较亮的象。
When the hologram fabricated by such technique is reconstructed with white light point source, a distortionless, white-black holographic image with certain depth is obtained.
采用这种技术摄制的全息图，在白光点源照明下再现，可获得有一定深度的无畸变的黑白色全息象。
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