For a concave mirror of radius \( 30 \mathrm{~cm} \) which is placed in water the focal length i...

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For a concave mirror of radius \( 30 \mathrm{~cm} \) which is placed in water the focal length in air and water differ by
a. \( 25 \mathrm{~cm} \)
b. \( 20 \mathrm{~cm} \)
c. \( 0 \mathrm{~cm} \)
d. \( 30 \mathrm{~cm} \)
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