ELEMENTS OF PHYSICS I
Physics 221

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CHAPTER 25
Optical instruments

NEW CONCEPTS

FORMULAS

Angular magnification of simple magnifier:

\begin{displaymath}M = {N\over f}\end{displaymath}

Magnification of telescope:

\begin{displaymath}M = - {f_o\over f_e}\end{displaymath}

Magnification of microscope:

\begin{displaymath}M \approx \left( {N\over f_e} \right) \left( {l\over f_o}\right)\end{displaymath}

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