A) parallel to principal axis
B) convergence
C) divergence
D) None of these
Correct Answer: B
Solution :
\[{{P}^{-}}=\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}-\frac{d}{{{f}_{1}}{{f}_{2}}}\] \[=\frac{1}{I}+\frac{1}{-0.25}-\frac{0.75}{(1)(-0.25)}\] \[=1-4+3=-3+3=0\]
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