One of the refracting surfaces of a prism of angle 30 is silvered. A ray of light incident at angle of 60 retraces its path. The refractive index of the material of prism is One of the refracting surfaces of a prism of angle 30 is silvered. A ray of light incident at angle of 60 retraces its path. The refractive index of the material of prism is October 6, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) , Facebook Messenger WhatsApp Share this:TwitterFacebook Related