A) 15 cm (Concave)
B) 15 cm (Convex)
C) 10 cm
D) 0
Correct Answer: A
Solution :
For lens u = wants to see = ? 30 cm and v = can see = ? 10 cm \[\therefore \frac{1}{f}=\frac{1}{v}-\frac{1}{u}\]\[=\frac{1}{-10}-\frac{1}{(-30)}\]\[\Rightarrow f=-\,15\,cm\]You need to login to perform this action.
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