Fundamental test B:Measuring grating constant and sound velocity in liquid using self-assembling optical path
The thinking,analysis and answer of the fundamental experiment question B of the 9th Chinese Undergraduate Physics Experiment Competition were introduced.Fundamental test B mainly consisted of three sub-questions:measuring the focal length of an unknown lens,measuring the grat-ing constant of the unknown grating and measuring sound velocity in liquid by self-assembling optical path.The contest questions were redesigned based on the content of university physics experiments,and gradually guided the candidates to complete three core elements often involved in optical experi-ments,i.e.the measurement of basic parameters of optical components,optical path construction and optical application.The whole process could comprehensively test students'mastery of basic optical knowledge,ability to design optical path and construct a hands-on optical path.To a certain extent,the results of the contest reflected the teaching effect and shortcomings of the current domestic optical experimental courses,and provided references for the further improvement of experimental teaching.
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