Question : 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
Question : 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