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A convex mirror with a focal length of –20.0 cm forms an image 12 cm behind the surface. Where is the object as measured from the surface?

Respuesta :

Given

The focal length is f= -20 cm

The image distance is v= -12cm

To find

The object distance

Explanation

The mirror formula is

[tex]\begin{gathered} \frac{1}{f}=\frac{1}{u}+\frac{1}{v} \\ \Rightarrow\frac{1}{^-20}=\frac{1}{u}+\frac{1}{^-12} \\ \Rightarrow u=30cm=3.0\times10\text{ cm} \end{gathered}[/tex]

Conclusion

The object distance is 30x10 cm.

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