Q

# Help me solve this - Optics - JEE Main-2

The graph shows how the magnification m produced by a thin lens varies with image distance $v$.

What is the focal length of the lens used?

• Option 1)

$\frac{b^{2}}{ac}$

• Option 2)

$\frac{b^{2}c}{a}$

• Option 3)

$\frac{a}{c}$

• Option 4)

$\frac{b}{c}$

Views

$m=1- \frac{V}{f}$

$slope=\frac{-1}{f}$

$\frac{-1}{f}=\frac{c}{b}$

$f=\frac{b}{c}$

Option 1)

$\frac{b^{2}}{ac}$

Option 2)

$\frac{b^{2}c}{a}$

Option 3)

$\frac{a}{c}$

Option 4)

$\frac{b}{c}$

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