Answer:29.56 cm
Explanation:
Given
magnification is 2.2
Object distance(u)=43 cm
and we know
[tex]m=-\frac{v}{u}[/tex]
[tex]2.2=-\frac{v}{-43}[/tex]
[tex]v=43\times 2.2=94.6 cm[/tex]
And focal length of convex lens is given by
[tex]\frac{1}{f}=\frac{1}{v}+\frac{1}{u}[/tex]
[tex]\frac{1}{f}=\frac{1}{94.6}+\frac{1}{43}[/tex]
f=29.56 cm
