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| 1. |
Which of the following is correct for the beam which enters the medium?(a) Travel as a cylindrical beam(b) Diverge(c) Converge(d) Diverge near the axis and converge near the periphery |
| Answer» (c) Since the refractive index is less at beam boundary, the ray at the edges of the beam move faster compared to the axis of beam. Hence the beam converges | |