【摘要】 反射法测三棱镜顶角要求望远镜、平行光管和三棱镜都要满足测试要求，对分光计调节的要求更全面。镜外辅助粗调法常被用于解决分光计粗调不理想的情况。针对该方法不易掌握的问题，通过分析平面镜中望远镜反射像的成像规律，确定了镜外辅助法调节良好，即达到最佳容错位置的标志现象，即从望远镜外观察到的绿色十字光源与望远镜分划板上的水平直径叉丝位于同一水平面上。三棱镜放置位置是影响狭缝反射像观察的重要因素。三棱镜最佳的放置位置为待测顶角A放到载物台中心，确保可以观察到AB和AC两个光学面反射的狭缝像。更多还原

【Abstract】 Measuring the top angle of a triangular prism by reflection method requires that the telescope, collimator and triangular prism all meet the test requirements.The requirements for spectrometer adjustment are more comprehensive.The method of coarse adjustment assisted by the reflected image outside the telescope is often used when the coarse adjustment of the spectrometer is not ideal.Considering that this method is not easy to master, by analyzing the imaging law of the reflected image of telescope in a plane mirror, it is determined that the landmark phenomenon of a good coarse adjustment(i.e.reaching the best tolerant position) is that the green cross light source observed from outside the telescope and the horizontal diameter on the telescope’s dividing plate is located on the same level.The placement of the prism is an important factor in the observation of the slit reflection image.The best placement of the prism is to place the top angle A to be measured at the center of the stage to ensure that the slit image reflected from both the AB and AC optical surfaces can be observed.更多还原