本题目来源于试卷: Optical Instruments，类别为 IB物理学
[问答题]
Give at least two advantage.i/rp 7np2vag x5e.ods for the use of large reflecting mirrors in ae;ht e2nzsd2+stronomical dt+hn2 ;ees z2telescopes.
参考答案:
A large reflecting mirror in a telescope has several advantages over a large refracting lens: One, the construction and grinding of a huge lens is very difficult (a mirror only needs one side to be ground and smoothed to perfection). Two, a huge lens is so heavy that it will sag under its own weight, especially since it needs to be held only along the edges of the lens in the telescope (mirrors can be well-supported along their entire back, non-reflecting, side). Three, a huge lens will have serious chromatic aberrations (a mirror has no chromatic aberrations).
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