A10 mm long pin is placed vertically in front of a concave mirror. A \( 5 \mathrm{~mm} \) long i...

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A10 mm long pin is placed vertically in front of a concave mirror. A \( 5 \mathrm{~mm} \) long image of the pin is formed at \( 30 \mathrm{~cm} \) in front of the mirror. The focal length of this mirror is
a. \( -30 \mathrm{~cm} \)
b. \( -20 \mathrm{~cm} \)
c. \( -40 \mathrm{~cm} \)
d. \( -60 \mathrm{~cm} \)
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