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29. Find the focal length (f) of a magnifying glass ifyou can see a diamond clearly when your eye is10 cm away from the glass, and the glass is 3 cmaway from the diamond.

Respuesta :

We have the following:

[tex]\frac{1}{f}=\frac{1}{d}+\frac{1}{d_0}[/tex]

replacing:

[tex]\begin{gathered} \frac{1}{f}=\frac{1}{10}+\frac{1}{3} \\ \frac{1}{f}=0.1+0.33 \\ \frac{1}{f}=0.43 \\ \frac{1}{0.43}=f \\ f=\frac{1}{0.43}=2.31 \end{gathered}[/tex]

the local length is 2.31 cm

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