退积反射是地层厚度向凹陷中心减薄且其顶部被“削截”的一种反射现象，与一般发生在凹陷边缘地层顶界被削截减薄的情形不同。

Retrogradation reflection is a reflected phenomenon that reflects the thinning strata and truncated its top in toward basin center, which is different from that takes place generally in basin margin.

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由于减反膜自身反射率曲线的波长依赖性和谱线宽度的有限性，故一般情况下镀膜面的实际反射率比减反膜自身的最低反射率高。

Due to the wavelength dependence and finite spectral width of the reflection curve, the reflectivity which takes effect is generally higher than the minimum reflectivity claimed.

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对特定的带宽，增加两种薄膜材料的折射率差和选择尽可能低的最外层折射率对获得优良的减反射特性是非常重要的。

For certain bandwidth, increasing difference between high and low index and selecting out-layer material with low index are very important for achieving an excellent anti-reflectance performance.

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