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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:091a42f6c4748025b72b34c7f12edc07c6f7f79e00e0f5e82232274fbc41738c"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "7: Interference"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 7.1, Page number 16"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "theta=40;    #angle of wedge(s)\n",
+      "beta=0.125*10**-2;   #fringe width(m)\n",
+      "\n",
+      "#Calculation\n",
+      "lamda=2*beta*theta*(math.pi/180)*(1/60)*(1/60);    #wavelength of light(m)\n",
+      "\n",
+      "#Result\n",
+      "print \"wavelength of light is\",int(lamda*10**10),\"angstrom\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "wavelength of light is 4848 angstrom\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 7.3, Page number 17"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "n=100;    #number of fringes\n",
+      "d=0.03*10**-3;    #distance moved(m)\n",
+      "\n",
+      "#Calculation\n",
+      "lamda=2*d/n;   #wavelength of light(m)\n",
+      "\n",
+      "#Result\n",
+      "print \"wavelength of light is\",lamda*10**10,\"angstrom\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "wavelength of light is 6000.0 angstrom\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 7.4, Page number 17"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "lamda1=5896*10**-10;    #wavelength of D1 line(m)\n",
+      "lamda2=5890*10**-10;    #wavelength of D2 line(m)\n",
+      "\n",
+      "#Calculation\n",
+      "d=lamda1*lamda2/(2*(lamda1-lamda2));    #distance the mirror has to be moved(m)\n",
+      "\n",
+      "#Result\n",
+      "print \"distance the mirror has to be moved is\",round(d*10**3,4),\"mm\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "distance the mirror has to be moved is 0.2894 mm\n"
+       ]
+      }
+     ],
+     "prompt_number": 13
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 7.5, Page number 18"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "mew=1.5;     #refractive index of plate\n",
+      "d=1.24;    #distance between dark fringes(mm)\n",
+      "\n",
+      "#Calculation\n",
+      "t=d/(mew-1);    #thickness of glass plate(mm)\n",
+      "\n",
+      "#Result\n",
+      "print \"thickness of glass plate is\",t,\"mm\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "thickness of glass plate is 2.48 mm\n"
+       ]
+      }
+     ],
+     "prompt_number": 15
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file