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Q.

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

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answer is 10.

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Detailed Solution

$f = 10 c m m = \frac{f}{f - u} m = \frac{1}{2} \frac{1}{2} = \frac{10}{10 - u} 10 - u = 20 \Rightarrow u = 10$

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