A) 255 m/s
B) 250 m/s
C) 350 m/s
D) None of these
Correct Answer: A
Solution :
\[n={{n}_{1}}-{{n}_{2}}\]\[\Rightarrow 10=\frac{v}{2{{l}_{1}}}-\frac{v}{2{{l}_{2}}}\]\[=\frac{v}{2}\left[ \frac{1}{{{l}_{1}}}-\frac{1}{{{l}_{2}}} \right]\] \[\Rightarrow 10=\frac{v}{2}\left[ \frac{1}{0.25}-\frac{1}{0.255} \right]\]\[\Rightarrow v=255\,m/s.\]
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