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

Question

Quizplus · Accepted Answer

All the listed options are disadvantages of using a single large lens in a telescope: they are expensive to fabricate, can sag due to edge support, cause chromatic aberration, and some materials absorb short wavelengths.

What Is a Disadvantage of Using a Single Large Lens