## Abstract

We discuss the manufacture and use of a prism pair to measure the
refractive index of thin liquid films with a spectrometer. The
method requires only a drop of liquid and is accurate to ∼2 ×
10^{-4}.

© 2001 Optical Society of America

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### Equations (3)

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(1)
$${n}_{x}=nsin\left[\mathrm{\alpha}+\mathrm{arc}sin\left(\frac{1}{n}sini\right)\right],$$
(2)
$$\mathrm{\delta}{n}_{x}={c}_{1}\mathrm{\delta}n+{c}_{2}\mathrm{\delta}i+{c}_{3}\mathrm{\delta}\mathrm{\alpha},$$
(3)
$${c}_{2}=\frac{cosicos\left[\mathrm{\alpha}+\mathrm{arc}sin\left(\frac{1}{n}sini\right)\right]}{{\left[1-{\left(\frac{1}{n}sini\right)}^{2}\right]}^{1/2}}.$$