Discussion
Assertion (A): Regular reflection of an oblique shock from a wall fails at high incident shock angles.
Reason (R): The reflected shock has to turn a stream already slowed by the incident shock.
Select the correct answer from the options below.
Answer: D
Both statements are true and the second explains the first. The slower downstream flow has a smaller maximum deflection available, and if the turning needed to restore flow tangency exceeds it, no regular reflection exists. A Mach reflection with a normal shock stem on the wall forms instead.
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