本文评述了光学选类星体光度函数演化的研究方面取得的进展。
This paper reviews the progress on studies of the cosmic evolution of the luminosity function of optically selected quasars.
在测量范围内可以产生单色辐射光学系统的分光光度计也可以使用。通常光谱是透光度（透射光强度与入射光强度之商）的函数。
Normally the spectrum is given as a function of transmittance, the quotient of the intensity of the transmitted radiation and the incident radiation.
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