What is a disadvantage of using a single large lens in a telescope?
A. Different colors of white light on passing through a lens focus at different points and result in a blurred image.
B. A lens has to be supported only at its edges, so the lens can sag in the middle.
C. Some lens materials completely absorb short wavelengths.
D. Large lenses are expensive to fabricate.
E. All of these choices are correct.
Answer: E
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