Physics 221

ELEMENTS OF PHYSICS I
Physics 221

CHAPTER 23
Light: geometric optics

NEW CONCEPTS

FORMULAS

Index of refraction

$\begin{displaymath}n = {c\over v}\end{displaymath}$

Focal length of spherical mirror of raidus r:

$\begin{displaymath}f = {r\over 2}\end{displaymath}$

Mirror (or lens) equation:

$\begin{displaymath}{1\over d_o} + {1\over d_i} = {1\over f}\end{displaymath}$

Magnification:

$\begin{displaymath}m = {h_i\over h_o} = {-d_i\over d_o}\end{displaymath}$

Snell's law:

$\begin{displaymath}n_1 \sin\theta_1 = n_2\sin\theta_2\end{displaymath}$

Critical angle for total internal reflection:

$\begin{displaymath}\sin \theta_{crit} = {n_2\over n_1}\end{displaymath}$

Power of a lens:

$\begin{displaymath}P = {1\over f}\end{displaymath}$

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