答案1
也许我忽略了什么,但我看不出这里需要align
环境;单一equation
环境似乎更自然。不过,我强烈建议您cos
用替换\cos
。
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\noindent
[text before equation]
\begin{equation}
g = m \frac{\lambda}{\cos(\theta) 2n} \label{eq:1}
\end{equation}
where $m$ is an integer ($1,2,3,\dots$), $\lambda$ the wavelength,
$\theta$ the incident angle, and~$n$ the refractive index of the
medium between the layers.
\end{document}
附录解决 OP 的后续评论:这是一个两行align
环境,其中第二“行”由 组成\parbox
。
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\noindent
[text before equation]
\begin{align}
&g = m \frac{\lambda}{\cos(\theta) 2n} \label{eq:1} \\
&\parbox[t]{10cm}{where $m$ is an integer ($1,2,3,\dots$),
$\lambda$ the wavelength, $\theta$ the incident angle, and~$n$
the refractive index of the medium between the layers.} \notag
\end{align}
[text after equation]
\end{document}