A ray of light is incident normally on the first refracting face of the prism of refracting angle A. The ray of light comes out at grazing emergence. If one half of the prism (shaded position) is knocked off, the same ray will : -

Question

G1 Physics · Accepted Answer

For the original prism the ray emerges grazing. After half of the prism is removed, apply Snell's law and the prism geometry to the remaining part. The emergence angle becomes e = sin⁻¹[(1/2) sec(A/2)]. Therefore option A is correct.