A) 1.35
B) 3
C) 6.2
D) 1
Correct Answer: A
Solution :
| Option [a] is correct. |
| Explanation: \[\frac{{{\mu }_{2}}}{v}-\frac{{{\mu }_{1}}}{u}=\frac{{{\mu }_{2}}-{{\mu }_{1}}}{\operatorname{R}}\] |
| Putting \[v\,\,=\,\,3\,cm\] |
| \[{{\mu }_{1}}\,\,=\,\,1\] |
| \[u\,\,=\,\,\infty \] |
| \[R\,\,=\,\,0.78\,cm\] |
| \[\frac{{{\mu }_{2}}}{3}-\frac{1}{\infty }\,\,=\,\,\frac{{{\mu }_{2}}\,-\,1}{0.78}\] |
| \[\therefore \,\,{{\mu }_{2}}\,\,=\,\,1.35\] |
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