Given,
Magnification of the mirror (m)=2.39
Distance between the face and mirror (u)=11cm
Let the focal length of the mirror be f.
m=u−v
⇒v=−11×2.39cm
=−26.29cm
Now, applying the mirror formula,
f1=v1+u1
Now, substituting the values,
f1=26.29−1+111
⇒f1=11×26.29−11+26.29
⇒f1=289.1915.29
⇒f=15.29289.19
f=18.913cm
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