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diff --git a/sample_notebooks/AlokDadlani/ALOK_DADLANI.ipynb b/sample_notebooks/AlokDadlani/ALOK_DADLANI.ipynb
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+{
+ "metadata": {
+  "celltoolbar": "Raw Cell Format",
+  "name": "",
+  "signature": "sha256:257a8f491d964b9b4b60a222b425920b6deeb80bc5dff761617e08199ac997af"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "SAMPLE EXAMPLES"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "EXAMPLE NUMBER 1"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Given that\n",
+      "D=80# separation between source and screen in cm\n",
+      "d=0.18# separation between sources in cm \n",
+      "n=4# order of fringe\n",
+      "x_n=1.08# distance from central bright fringe in cm  \n",
+      "print \"Standard formula used     x_n= n*lambda1*D/d \"\n",
+      "\n",
+      "lambda1=d*x_n/(D*n)*1e7\n",
+      "print  \"Wavelength of light used is\" ,lambda1, \"Angstrom.\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Standard formula used     x_n= n*lambda1*D/d \n",
+        "Wavelength of light used is 6075.0 Angstrom.\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "EXAMPLE NUMBER 2"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Given that\n",
+      "beta=0.0320#fringe width in cm\n",
+      "D=100# separation between source and screen in cm\n",
+      "d=0.184# separation between sources in cm \n",
+      "print \"   Standard formula used   beta=lambda1*D/d  \"\n",
+      "lambda1=d*beta/D*1e8\n",
+      "print \"Wavelength of light used is\" ,lambda1,\"Angstrom.\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "   Standard formula used   beta=lambda1*D/d  \n",
+        "Wavelength of light used is 5888.0 Angstrom.\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "EXAMPLE NUMBER 3"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      " #Given that\n",
+      "beta=0.02 #fringe width in cm\n",
+      "D=100 # separation between source and screen in cm\n",
+      "u=30 # separation between slit and convex lens in cm\n",
+      "I=0.7 # separation between two images of slits on screen in cm\n",
+      "print\"   Standard formula used   beta=lambda1*D/d  \" \n",
+      "v=100-u\n",
+      "O=I*u/v\n",
+      "d=O\n",
+      "lambda1=d*beta/D*1e8\n",
+      "print\"  Wavelength of light used is\",lambda1, \"Angstrom.\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "   Standard formula used   beta=lambda1*D/d  \n",
+        "  Wavelength of light used is 6000.0 Angstrom.\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "EXAMPLE NUMBER 4"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Given that\n",
+      "x_n=1.88# fringe separation of nth fringe from central fringe in cm \n",
+      "N=20# order of fringe\n",
+      "beta=0.02#fringe width in cm\n",
+      "D=120# separation between source and eyepiece in cm\n",
+      "d=0.076# separation between sources in cm \n",
+      "print \"   Standard formula used     beta= lambda1*D/d  \"\n",
+      "beta=x_n/N # calculation of angle formed\n",
+      "lambda1=d*beta/D*1e8 # calculation of Wavelength of light\n",
+      "print \"  Wavelength of light used is\", round(lambda1,4) , \"Angstrom.\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "   Standard formula used     beta= lambda1*D/d  \n",
+        "  Wavelength of light used is 5953.3333 Angstrom.\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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