3.3.6　Analysis and questions

(1)How to quickly adjust the optical lever system in this experiment?

(2)Why the initial load(i.e.2 kg weights)on the weight holder is not included in the calculations?

(3)How many types of length measurements are there in this experiment?What instruments are used for each length measurement?Why?(https://www.daowen.com)

(4)Which is the most critical error source in this experiment according to the error analysis?Why?

(5)Why can we use the optical lever magnification method to measure micro length variation?How to change the magnification of optical lever magnification system?