描述了各向同性玻璃的弯曲试验。波长相关的应力光学系数是材料的一个特征值，根据应力双折射测量结果确定应力是必要的。

Describes the bending test for isotropic glass. The wavelength-dependent stress-optical coefficient is a characteristic value of materials and it is necessary for determining the stress from results of measurement of stress birefringence.