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  4. A point object is placed at a distance of 80 mathrm~cm from convex mirror of focal length 80 mathrm~cm. The image will form at

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Q. A point object is placed at a distance of $80 \mathrm{~cm}$ from convex mirror of focal length $80 \mathrm{~cm}$. The image will form at

Solution:

image
$u=-80, f=80$
$\frac{1}{f}=\frac{1}{v}+\frac{1}{u}$
$\Rightarrow \frac{1}{80}=\frac{1}{v}-\frac{1}{80} \quad v=40 \mathrm{~cm}$