N an object or material that refracts 折射媒介
Reflector telescopes can also be made much, much larger than refractors.
反射望远镜能够做得很大，远大于折射望远镜。
Such telescopes are called reflectors, and they offer major advantages over refractors, which use two lenses and suffer from optical distortion effects.
这种类型的望远镜称为反射望远镜，比折射望远镜更具有优势，后者需要用到两个透镜，而且会受到光学畸变效应的影响。
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