A) 1.5 D
B) 3.0 D
C) -15 D
D) +15D
Correct Answer: D
Solution :
Given, \[u=-10\text{ }cm\]and \[v=20\text{ }cm\] \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] \[\Rightarrow \] \[\frac{1}{f}=\frac{1}{20}+\frac{1}{10}\] \[f=\frac{20}{3}\] Power \[P=\frac{100}{f}=\frac{100\times 3}{20}=+15D\]You need to login to perform this action.
You will be redirected in
3 sec