Astronomers could gain only a biased idea of the universe when they were limited to the narrow wavelength band of visible rays.

由于只能在可见光的狭窄波段内观测，天文学家关于宇宙的概念显然只能是片面的。

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This invention provides an infrared diffractive lens capable of focusing infrared rays within a wide range of wavelength band effectively.

本发明提供一种可高效地对宽波长范围的红外线进行聚光的红外线衍射透镜。

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A luminosity function is the number of objects of a particular sort as a function of their luminosity or brightness in some wavelength band.

光度函数是作为某一波段的光度或亮度的函数的特定种类的天体数目。

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At the moment, it affects visible light but a small amount of tweaking should produce a band gap at a wavelength of 1.5 microns (millionths of a metre).

ECONOMIST: New-age crystals