Hi. I am reviewing a question from the end of chapter 25 set in the first TBR orgo I book in Chapter 3. The question is #8. I don't understand the explanation of "when using a polarimeter, an observed optical rotation of +233 and -127 would result in the same reading (given that a full circle is 360 degrees)". How can the observed rotation be the same if the specific activities are different? Thanks.