A) 1.34
B) 1
C) 1.5
D) 1.86
Correct Answer: A
Solution :
[a] Use \[\frac{{{\mu }_{2}}}{v}-\frac{{{\mu }_{1}}}{u}=\frac{{{\mu }_{2}}-{{\mu }_{1}}}{R}\] Here \[{{\mu }_{2}}=\mu =?\] \[{{\mu }_{1}}=1\] \[u=\infty \] \[v=3.075\text{ }cm,R=7.8\text{ }mm\] \[\frac{\mu }{3.075}-\frac{1}{\infty }=\frac{\mu -1}{0.78}\] \[\Rightarrow \] \[\mu =1.34\]
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