A dentist uses a mirror of focal length \(24\,\text{mm}\). He views a cavity in the tooth of a patient by holding the mirror at a distance of \(16\,\text{mm}\) from the cavity. The magnification is
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For a concave mirror, when the object is placed between the pole and focus, the image formed is virtual, erect and magnified. Use
\[
m=-\frac{v}{u}
\]
after applying the mirror formula.