A) -66.6cm
B) +1.5m
C) +66.6 cm
D) -1.5m
Correct Answer: A
Solution :
[a] Power = \[\frac{1}{Focal\text{ }length\text{ }\left( in\text{ }metre \right)}\] \[-1.5=\frac{1}{f}\] or \[f=-\left( \frac{1\times 100}{1.5} \right)\,\,cm\] \[=\text{ }-\text{ }66.6\text{ }cm\]
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