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@@ -1,144 +0,0 @@
-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:1ec2372be7a9974010a31557c9658c85707025e7a87f82e6ef26be63dbcfb0e7"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter 3:Planes in Crystals"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 3.11 , Page no:61"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "import math\n",
-      "from __future__ import division\n",
-      "\n",
-      "#given\n",
-      "h=3;\n",
-      "k=2;\n",
-      "l=1; #miller indices\n",
-      "a=4.2E-8; #in cm (lattice constant)\n",
-      "\n",
-      "#calculate\n",
-      "d=a/math.sqrt(h**2+k**2+l**2); #calculation for interplanar spacing\n",
-      "d=d*1E8; #changing unit from cm to Angstrom\n",
-      "\n",
-      "#result\n",
-      "print\"The interplanar spacing is d=\",round(d,2),\"cm\";\n",
-      "print\"\\t\\t\\t   d=\",round(d,2),\"Angstrom\";"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The interplanar spacing is d= 1.12 cm\n",
-        "\t\t\t   d= 1.12 Angstrom\n"
-       ]
-      }
-     ],
-     "prompt_number": 1
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 3.12 , Page no:61"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "import math\n",
-      "from __future__ import division\n",
-      "\n",
-      "#given\n",
-      "h=1;k=1;l=1; #miller indices\n",
-      "a=2.5;b=2.5;c=1.8; #in Angstrom (lattice constants for tetragonal lattice )\n",
-      "\n",
-      "#calculate\n",
-      "d=1/math.sqrt((h/a)**2+(k/b)**2+(l/c)**2); #calculation for interplanar spacing\n",
-      "\n",
-      "#result\n",
-      "print\"The lattice spacing is d=\",round(d,2),\"Angstrom\";"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The lattice spacing is d= 1.26 Angstrom\n"
-       ]
-      }
-     ],
-     "prompt_number": 2
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 3.15 , Page no:63"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "import math\n",
-      "from __future__ import division\n",
-      "\n",
-      "#given\n",
-      "h=1;k=0;l=0; #miller indices\n",
-      "a=2.5; #in Angstrom (lattice constant)\n",
-      "\n",
-      "#calculate\n",
-      "a=a*1E-10; #hence a is in Angstrom\n",
-      "d=a/math.sqrt(h**2+k**2+l**2); #calculation for interplanar spacing\n",
-      "p=d/a**3;\n",
-      "\n",
-      "#result\n",
-      "print\"The density is p=\",round(p),\"lattice points/m^2\";"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The density is p= 1.6e+19 lattice points/m^2\n"
-       ]
-      }
-     ],
-     "prompt_number": 3
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file