How is chromatic aberration most often corrected in a modern refracting telescope?

Ablank is a type of chord that consists of three pitches on consecutive lines or spaces

One reason people like impressionism is because it seems a )so easy b) very moral c) optimistic d) to be about important events

In areas where even the experts disagree; everyone has a right to his own opinion. i mean if answers aren’t given just like in lots of things; then it has to be just anyone’s opinion. is this dualism multiplicity relativism or commitment