At what angle should a ray of light be incident on the face of a prism of refracting angle `60^(@)`, so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is 1.524.

A ray of light falls on the side of a prism ABC whose refracting angle Is A. The angles of incklence and refraction at the first face AB is i_1 and r_1 while at the second face AC is i_2 and r_2 If the refractive index of the material of the below prism is 1.5, Find the critical angle of the prism.