亮斑最大宽度究竟多大沈平（江苏省苏州市第１０中学，２１５００６）在各种中学物理习题集中，常见有这样一道几何光学题：一束平行单色光从真空射向一半球形玻图１璃体，球半径为Ｒ．入射光的方向垂直于直径所在平面，如图１所示．若玻璃的折射率为２，则在玻璃体正下方... What is the maximum width of the bright spot? What is the level of the maximum width? (10th Middle School, Suzhou, Jiangsu Province, 215006) Concentrated on a variety of middle school physics exercises. There is a common geometrical optical problem: A beam of parallel monochromatic light is emitted from a vacuum towards a half-spherical glass. Vitreous, spherical radius R. The direction of incident light is perpendicular to the plane where the diameter lies, as shown in Figure 1. If the glass has a refractive index of 2, it is directly below the glass body...