
Originally Posted by
JaneBennet
What do you mean by “efficient”? :?
A prism in mathematics (geometry) is different from a prism in physics (optics). The webpage you are looking at is about mathematical prisms. In optics, however, a prism is simply any transparent object with a high refractive index used to refract light; what shape it is depends on what you want it to do with your light.
So yes, an optical prism can be spherical if you like. But you did not say what your experiment wants to achieve with light, so I can’t say what the “ideal” shape of prism for your purpose might be.