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}

Answers (1)

 

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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