The angle of incidence for an equilateral prism is 60 degree. What should be the refractive index of prism so that the ray is parallel to the base inside the prism ? The angle of incidence for an equilateral prism is 60 degree. What should be the refractive index of prism so that the ray is parallel to the base inside the prism ? June 26, 2021 Category: Arihant Physics by D.C Pandey , Chapter 9 - Ray Optics , Volume 2 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related