The size of the real heart is B) 11.7 cm
Explanation:
In lenses, mirror and other optical systems, the magnification factor is given by:
[tex]M=\frac{y'}{y}[/tex]
where
y' is the size of the image
y is the size of the real object
In this problem, we have:
M = 1.3 is the magnification factor
y' = 15.2 cm is the size of the image (the image of the heart)
Solving for y, we find the actual size of the heart:
[tex]y=\frac{y'}{M}=\frac{15.2 cm}{1.3}=11.7 cm[/tex]
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