The graph shows the variation of the magnification (m) produced by a thin lens with image distance (v). The focal length of the lens is :
1
\(\frac{b^{2}}{a c} \)
2
\(\frac{b^{2} c}{a} \)
3
\(\frac{a}{c} \)
4
\(\frac{b}{c}\)
The graph shows the variation of the magnification (m) produced by a thin lens with image distance (v). The focal length of the lens is :