An object that is placed at a distance of \( 30 \mathrm{~cm} \) from a concave mirror gets its i...

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An object that is placed at a distance of \( 30 \mathrm{~cm} \) from a concave mirror gets its image at the same point. The focal length of the mirror is
a. \( -45 \mathrm{~cm} \)
b. \( 45 \mathrm{~cm} \)
c. \( -15 \mathrm{~cm} \)
d. \( +15 \mathrm{~cm} \)
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