Case-Based-II: A converging mirror forms a real image of height \( 4 \mathrm{~cm} \), of an obje...

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Case-Based-II: A converging mirror forms a real image of height \( 4 \mathrm{~cm} \), of an object of height \( 1 \mathrm{~cm} \) placed \( 20 \mathrm{~cm} \) away from the mirror.
Magnitude of the focal length of the mirror is
a. \( 15 \mathrm{~cm} \)
b. \( 16 \mathrm{~cm} \)
c. \( 17 \mathrm{~cm} \)
d. \( 18 \mathrm{~cm} \)
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