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利用定向反射镜进行垂直定向反射照相，是近年来出现的照相新技术。它使用方便，对潜在手印显现效果好，在实验教学中，学生在使用定向反射镜过程中取得一定效果，但应用中也碰到一些问题值得探讨。
The use of directional mirrors for vertical directional reflectance photography is a new photographic technique that has emerged in recent years. It is easy to use and has a good effect on potential fingerprints. In experimental teaching, students have achieved some results in the use of directional mirrors, but some problems encountered in applications are worth discussing.