Solving a problem in physics section 42 point 36 optics

Solving a problem in physics section 42 point 36 optics

36. Prove that if a monochromatic beam of light falls on the face of the prism with a refractive index n at a small angle, then with a small refractive angle A of the prism deflection angle φ of rays does not depend on the angle of incidence and is equal to A (n-1).

Additional information:

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)