Which of the following is NOT a reason to use a reflecting telescope rather than a refractor?
A) Heavy lenses, which can only be supported at their edges, tend to deform under their own weight.
B) Lenses are harder to focus than mirrors.
C) Lenses are subject to chromatic aberration.
D) A lens must have two precision surfaces; a mirror needs only one.
E) Lenses absorb light, while mirrors do not.
B
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Fill in the blank(s) with correct word
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