How are the streamlines for a conical flow behind a shock wave?

How are the streamlines for a conical flow behind a shock wave? Correct Answer Curved at the beginning, parallel as surface tends to infinity

For a conical flow at a given Mach number, the shock formation occurs at the vertex of the cone. The streamlines behind the shock wave are initially curved due to 3 – dimensional space unlike streamlines behind the shockwave on a wedge which is parallel. These streamlines eventually become parallel at the cone’s surface tends to infinity.
Bissoy MCQ

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