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+### Условие
+
+$12.2.4.$ [Вставьте условие задачи]
+
+### Решение
+
+![|1215x674, 55%](../../img/12.2.4/12.2.4.png)
+
+### Solution
+According to the Huygens-Fresnel principle, each element of the slit area becomes a source of a spherical wave. The amplitude of oscillations at a certain point at a distance $r \gg b$ is the sum of the amplitudes of these waves.
+![For problem $12.2.4$|813x555, 70%](../../img/12.2.4/12.2.4_1.png)
+
+#### Ответ
+
+[Вставьте краткий ответ или результат в рамке]