365123 The refractive index of the material of a prism is \(\sqrt 2 \) and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is

365124 The cross-section of a prism has the form of an isosceles triangle. One of the equal faces is silvered. A ray is normally incident on the other once's face and being reflected twice inside the prism emerges through the base of prism perpendicular to base. Angle of prism is found to be \(\pi /n.\) The value of \(n\) is

365123 The refractive index of the material of a prism is \(\sqrt 2 \) and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is

365124 The cross-section of a prism has the form of an isosceles triangle. One of the equal faces is silvered. A ray is normally incident on the other once's face and being reflected twice inside the prism emerges through the base of prism perpendicular to base. Angle of prism is found to be \(\pi /n.\) The value of \(n\) is