Answer
a. 6.06 cm.
b. 4.125 mm.
Work Step by Step
a. Use the lens equation.
$$\frac{1}{s}+\frac{1}{s’}=\frac{1}{f}$$
$$\frac{1}{s}+\frac{1}{-25.0cm}=\frac{1}{8.00cm}$$
$$s=6.06cm$$
b. Calculate the magnification.
$$m=-\frac{s’}{s}=-\frac{-25.0cm }{6.06cm}=4.125$$
Find the height of the image.
$$|y’|=|m||y|=(4.125)(1.00mm)=4.125mm$$
