A) ? 100 m
B) + 5 m
C) ? 5 m
D) Very large
Correct Answer: C
Solution :
For lens u = want?s to see =\[\infty \] v = can see = ? 5 m \ From \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\]\[\Rightarrow \frac{1}{f}=\frac{1}{-5}-\frac{1}{\infty }\]\[\Rightarrow f=-5\,m.\]You need to login to perform this action.
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