Sectors of it represent corresponding fractions of a wavelength. 它的各個(gè)弧段則代表一個(gè)波長(cháng)的相應分數。
This lens is in focus only for a single wavelength, so that the throughput of the system is wavelength-dependent. 鏡頭只對單一波長(cháng)聚焦，這樣系統的處理能力就依賴(lài)于波長(cháng)。
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