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一几何光学(注)的附录一的光学杂例5是这样一个题目:“光线投射于折射率为3~(1/2)之球面,入射角为60°,在经过一次全反射后,复透入空气中,试证光线的出射线和入射线平行,但方向相反”.并且画出了如图一所示的图,对题目给出了证明. 让我们特别注意题目中的“……在经过一次全反射后,复透入空气中,……”题目的意思肯定了光线在B点发生全反射. 下面我们将来证明:在任何情况下,进入了球的光线在球及空气的分界面上发生全反射是不可能的.
One optical miscellaneous example 5 of Appendix 1 of a geometrical optics (Note) is: “The light is projected on a spherical surface with a refractive index of 3 to 1⁄2, and the incident angle is 60°. After a total reflection, Into the air, test light rays and rays in parallel, but in the opposite direction “. And draw the figure shown in Figure 1, the proof given the subject. Let us pay special attention to the title ”...after undergoing a total reflection, re-entering into the air, the meaning of the title ... affirmed the total reflection of light at point B. Here we will prove in the future: In any case, the light entering the ball is in the ball. It is impossible for total reflection to occur at the interface with air.