What is the relationship between thickness of lens and focal length?

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

In a good thermo flask the main cause of heat loss is

Acar travels 40m in 8 seconds find the car speed