AP Physics 2 / Unit 13: Geometric Optics
13.2 Images Formed by Mirrors
Notes
$$\frac{1}{f}=\frac{1}{d_o}+\frac{1}{d_i},\qquad M=-\frac{d_i}{d_o}$$
- Plane mirrors: virtual, upright, same size.
- Concave mirrors: real or virtual; $f>0$. Convex: always virtual, upright, smaller; $f<0$.
Practice
A concave mirror with $f=10$ cm; object at 30 cm. $d_i=$
$\displaystyle \frac{1}{10}-\frac{1}{30}=\frac{2}{30}$.
Car side mirrors are convex because they:
Smaller, upright images.
A plane mirror image is:
Behind the mirror.
Ready for more? Take the Unit 13 test.