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-rw-r--r--source/know/concept/lyddane-sachs-teller-relation/index.md4
1 files changed, 2 insertions, 2 deletions
diff --git a/source/know/concept/lyddane-sachs-teller-relation/index.md b/source/know/concept/lyddane-sachs-teller-relation/index.md
index e80bf00..9cec9dc 100644
--- a/source/know/concept/lyddane-sachs-teller-relation/index.md
+++ b/source/know/concept/lyddane-sachs-teller-relation/index.md
@@ -219,8 +219,8 @@ i.e. the material becomes a perfect reflector:
$$\begin{aligned}
R
- = \bigg| \frac{i \sqrt{|\varepsilon_r|} - 1}{i \sqrt{|\varepsilon_r|} + 1} \bigg|^2
- = \frac{|\varepsilon_r|^2 + 1^2}{|\varepsilon_r|^2 + 1^2}
+ = \bigg| \frac{i \sqrt{-\varepsilon_r} - 1}{i \sqrt{-\varepsilon_r} + 1} \bigg|^2
+ = \frac{\varepsilon_r^2 + 1^2}{\varepsilon_r^2 + 1^2}
= 1
\end{aligned}$$