A) line of \[5890\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) line of \[5896\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) both a and b
D) none of these
Correct Answer: D
Solution :
On passing light emitted front sodium bulb through sodium vapour, no light will be seen, because light is absorbed by sodium vapour.
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