Discussion
Assertion (A): Schlieren and shadowgraph give the same information about a flow.
Reason (R): Both techniques respond to variations in the density of the gas.
Select the correct answer from the options below.
Answer: C
The assertion is false and the reason is true. Both do respond to density variation, but schlieren responds to the first derivative and shadowgraph to the second, so a shock appears as a line in one and as a light-dark pair in the other. They are complementary rather than equivalent.
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