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三棱镜对白光有色散作用 ,白光经过三棱镜后 ,会在三棱镜后面的光屏上出现彩色光谱 .实验表明 ,当三棱镜周围的介质和三棱镜相比是光疏介质时 ,光谱中的红光靠近三棱镜的顶端 ,紫光靠近三棱镜的底端 ,中间按照橙色、黄色、绿色、蓝色的规律从顶端向底端排列 .充分地利用三棱镜
The prism has a dispersion effect on white light. After the white light passes through the prism, color spectrum appears on the screen behind the prism. Experiments show that when the medium around the prism is an opaque medium compared with the prism, the red light in the spectrum is close to the prism. At the top, the violet light is near the bottom of the prism and the middle is arranged in orange, yellow, green and blue from the top to the bottom. Make full use of the prism.