A) 1 D
B) - 1D
C) 25 D
D) - 25 D
Correct Answer: A
Solution :
[a] By lens maker formula, |
\[\frac{1}{{{f}_{a}}}=(\mu -1)\,\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)=(1.5-1)\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] ...(i) |
and |
(ii) |
Thus, |
\[{{f}_{m}}=-8\times {{f}_{a}}=-8\,\times \,\frac{-1}{5}\] |
\[{{P}_{m}}=\frac{\mu }{{{f}_{m}}}\,=\frac{1.6}{1.6}\,=1\,D\] |
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