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\begin{figure}\centerline{ \psfig{file=problems/prob_13_4.eps,height=2.5in} }\end{figure}

You would like to eliminate the reflected light from a flat glass pane for perpendicularly incident light of wavelength 550 nm. The index of refraction of the glass is $n_g = 1.5$, and the index of refraction of the coating material to be used is $n_c = 1.25$. What minimum thickness $t$ of the coating material will have the desired effect? (Try to show your reasoning, and don't forget ``details''.)

Robert G. Brown 2003-02-09