diff --git a/4.7.2-pockels-effect/Untitled.ipynb b/4.7.2-pockels-effect/Untitled.ipynb
deleted file mode 100644
index 42e7b71..0000000
--- a/4.7.2-pockels-effect/Untitled.ipynb
+++ /dev/null
@@ -1,140 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "a1e0c9d5-9e18-499c-b986-00b384691085",
-   "metadata": {},
-   "source": [
-    "кристалл 3x3x26mm $\\text{LiNiO}_3$\n",
-    "\n",
-    "$\\lambda = 630$ nm\n",
-    "\n",
-    "$n_0 = 2.29$"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "207d3fe9-b468-46eb-bef7-eed6aa07d3ae",
-   "metadata": {},
-   "source": [
-    "$L = 637\\pm1$ mm"
-   ]
-  },
-  {
-   "cell_type": "raw",
-   "id": "ed1dbc1b-0580-4c7e-a0a6-011d0d1680b0",
-   "metadata": {},
-   "source": [
-    "2r\n",
-    "47\n",
-    "65\n",
-    "81\n",
-    "92\n",
-    "103\n",
-    "113"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "6b36bceb-3b08-48e3-90dd-16fb55fd7d90",
-   "metadata": {},
-   "source": [
-    "For 90 deg (314 deg)\n",
-    "\n",
-    "$U_{\\lambda/2} = 390 \\pm 15$ V\n",
-    "\n",
-    "$U_{\\lambda} = 810 \\pm 15$ V\n",
-    "\n",
-    "$U_{3\\lambda/2} = 1230 \\pm 15$ V"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "022be70a-84f4-4de8-bfff-9a459a7bcc70",
-   "metadata": {},
-   "source": [
-    "For 0 deg (44 deg)\n",
-    "\n",
-    "не удалось увидеть (слабо меняется)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "id": "7ac90403-b282-4c23-a969-0a91cf30d10d",
-   "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "405.0"
-      ]
-     },
-     "execution_count": 1,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "(390 + 810 + 1230) / 6"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "515cd5ed-241a-4132-a42c-b918e769c194",
-   "metadata": {},
-   "source": [
-    "6 п -- круговая поляризация (???)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "aa9a0479-67df-4fb7-a73a-d730e884f53e",
-   "metadata": {},
-   "source": [
-    "переменка\n",
-    "\n",
-    "400\n",
-    "\n",
-    "тд + фото"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "11cc86ab-bf25-4511-81ad-831bf2d92bb4",
-   "metadata": {},
-   "source": [
-    "при переходе к параллельной поляризации получается линия"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "255dc6f7-f011-4334-a981-356cf0e8fe58",
-   "metadata": {},
-   "outputs": [],
-   "source": []
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.10.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}