Mirror equation:

$\overline{)\frac{\mathbf{1}}{{\mathbf{d}}_{\mathbf{o}}}{\mathbf{+}}\frac{\mathbf{1}}{{\mathbf{d}}_{\mathbf{i}}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{f}}}$, where d_{o} is the object distance, d_{i} is the image distance, and f is the focal length.

The focal length is given by:

$\overline{){\mathbf{f}}{\mathbf{=}}\frac{\mathbf{r}}{\mathbf{2}}}$, where r is the radius of curvature.

An object is located a distance d_{o} = 7.2 cm in front of a concave mirror with a radius of curvature r = 18.1 cm.

a. Write an expression for the image distance, d_{i}.

b. Numerically, what is the value of image distance, d_{i} in centimeters.

c. Is this a real or virtual image?

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