A concave mirror of focal length \( 20 \mathrm{~cm} \) forms an image twice the size of object. ...

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A concave mirror of focal length \( 20 \mathrm{~cm} \) forms an image twice the size of object. What will be the position of the object for the virtual image?
a. \( 20 \mathrm{~cm} \)
b. \( 30 \mathrm{~cm} \)
c. \( 10 \mathrm{~cm} \)
d. At infinity
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