A) \[\ell {{\left( \frac{u-f}{f} \right)}^{1/2}}\]
B) \[\ell {{\left( \frac{u-f}{f} \right)}^{2}}\]
C) \[\ell {{\left( \frac{\,f}{u-f} \right)}^{1/2}}\]
D) \[\ell {{\left( \frac{\,f}{u-f} \right)}^{2}}\]
Correct Answer: D
Solution :
[d] The axial magnification \[\delta v=-\frac{{{v}^{2}}}{{{u}^{2}}}\frac{dt}{dt}\] \[={{\left( \frac{f}{u-f} \right)}^{2}}\,\ell .\]
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