A) \[-4.8\text{ }cm,-3.3\text{ }D~\]
B) \[-5.8\text{ }cm,-4.3\text{ }D\]
C) \[-7.5\text{ }cm,-6.3\text{ }D\]
D) \[-15.8\text{ }cm,-6.3\text{ }D\]
Correct Answer: D
Solution :
\[v=-15\,cm,\] \[u=-300\,cm\] from lens formula \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] \[\Rightarrow \] \[\frac{1}{f}=\frac{1}{-15}-\frac{1}{-300}\] \[\Rightarrow \] \[f=\frac{-300}{19}=-15.8\,cm\] and power \[P=\frac{100}{f}cm=\frac{-100\times 19}{300}=-6.33D\]You need to login to perform this action.
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