A) ? 75, 50
B) ? 10, 15
C) 75, 50
D) ? 15, 10
Correct Answer: D
Solution :
\[\frac{{{f}_{1}}}{{{f}_{2}}}=\frac{2}{3}\] .....(i) \[\frac{1}{{{f}_{1}}}-\frac{1}{{{f}_{2}}}=\frac{1}{30}\] .....(ii) Solving equation (i) and (ii) \[{{f}_{2}}=-\,15\,cm\] (Concave) \[{{f}_{1}}=10\,cm\] (Convex)You need to login to perform this action.
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