A) 1.2 cm
B) 3.2 cm
C) 2.8 cm
D) 1.6 cm
Correct Answer: A
Solution :
[a]By using \[\frac{{{\mu }_{2}}}{v}-\frac{{{\mu }_{1}}}{u}=\frac{{{\mu }_{2}}-{{\mu }_{1}}}{R}\] |
where \[u=?,\,\,v=-1\,\,cm,\,\,{{\mu }_{1}}=1.5,\,\,{{\mu }_{2}}=1,\,\,R=-2\,cm\] |
\[\frac{1}{-1}-\frac{1.5}{u}=\frac{1-1.5}{(-2)}\] |
\[\Rightarrow \] \[u=-\frac{6}{5}\,=-1.2\,cm\] |
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