A) 4
B) 5
C) 1
D) 8
Correct Answer: A
Solution :
\[\Delta n=v\left[ \frac{1}{{{\lambda }_{1}}}-\frac{1}{{{\lambda }_{2}}} \right]=396\,\left[ \frac{1}{0.99}-\frac{1}{1} \right]=3.96\approx 4.\]
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