A) + 6.5D
B) - 6.5 D
C) + 7.5 D
D) - 0.75 D
Correct Answer: D
Solution :
\[P=\frac{1}{F}=\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}=\frac{1}{(+0.8)}+\frac{1}{(-0.5)}=-\,0.75\ D\]
You need to login to perform this action.
You will be redirected in
3 sec
