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  4. A convex mirror has radius of curvature of 20cm . An object is placed at such a distance from the mirror that the size of image is exactly half that of the object. The object must be at :-

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Q. A convex mirror has radius of curvature of $20cm$ . An object is placed at such a distance from the mirror that the size of image is exactly half that of the object. The object must be at :-

NTA AbhyasNTA Abhyas 2022

Solution:

$f=10,m=\frac{f}{f - u}$
$m=\frac{1}{2}\Rightarrow u=-10$