恒偏向棱镜是指能恒定改变光束传输方向的转向元件。
Constant deviation prism is a turning element which can invariably transform the propagating direction of the light beam.
借助高精度的测角仪器，就可测量棱镜的顶角和最小偏向角，从而得到光学玻璃的折射率。
With the help of a precise angle-measuring device, the apex Angle and the minimum deviation Angle of the prism can be measured; hence the optical refractive index of the glass.
介绍了一种通过寻找偏向角随入射角变化最大的位置 ，测三棱镜折射率的方法。
The article introduces a method of measuring the refactive index of triprism by searching the maximal position of the deviation angle by following the angle of incidence changing.
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