NCERT Example 9.8 - Ray Optics and Optical Instruments
Question: 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 TIR at the other face? Refractive index of prism is 2/√3.
Answer: For n = √2, A = 60°: incident angle ≈ **sin⁻¹(√2 sin 15°) ≈ 30.7°** (NCERT Example).
Full step-by-step NCERT solution with diagrams on Something by Zero.