What is the difference between Co=EoA/r and Co=EA/r​

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

What is a carrier wave and how does it affect what you hear on the radio