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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:dc1d02c818142fc43f1bb36bcc3b4789ed6aba6b82727804f7035772e1b68c40"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter7-Interface and Diffraction"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg146"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 7.1\n",
+      "##plane parallel thin film\n",
+      "\n",
+      "##given values\n",
+      "x=5890*10**-10;##wavelength of light in metre\n",
+      "n=1.5;##refractive index\n",
+      "r=60*math.pi/180.;##angle of refraction in degree\n",
+      " ##calculation\n",
+      "t=x/(2*n*math.cos(r));\n",
+      "print'%s %.2f %s'%('thickness of plate (in micrometre) is:',t*10**6,'');"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "thickness of plate (in micrometre) is: 0.39 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2-pg151"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 7.2\n",
+      "##wedge shaped thin film\n",
+      "\n",
+      "##given values\n",
+      "x=5893*10**-10.;##wavelength of light in metre\n",
+      "n=1.5;##refractive index\n",
+      "y=.1*10**-3.;##fringe spacing\n",
+      " ##calculation\n",
+      "z=x/(2.*n*y);##angle of wedge\n",
+      "alpha=z*180./math.pi;##conversion of radian into degree\n",
+      "print'%s %.2f %s'%('angle of wedge (in degree) is:',alpha,'');"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "angle of wedge (in degree) is: 0.11 \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex3-pg156"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 7.3\n",
+      "##Newton's ring experiment- calculation of refractive index\n",
+      "\n",
+      "##given values\n",
+      "D1=1.5;##diametre (in cm)of tenth dark ring in air\n",
+      "D2=1.27;##diametre (in cm)of tenth dark ring in liquid\n",
+      "\n",
+      "\n",
+      " ##calculation\n",
+      "n=D1**2./D2**2.;\n",
+      "print'%s %.2f %s'%('refractive index of liquid  is',n,'');"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "refractive index of liquid  is 1.40 \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex4-160"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 7.4\n",
+      "##nonreflecting film\n",
+      "\n",
+      "##given values\n",
+      "l=5500*10**-10.;##wavelength of light\n",
+      "n1=1.33;##refractive index of water\n",
+      "n2=1.52;##refractive index of glass window pane\n",
+      "x=math.sqrt(n1);##to check if it is nonreflecting\n",
+      "\n",
+      " ##calculation\n",
+      "t=l/(4.*n1);##thickness of water film required\n",
+      "print'%s %.2f %s'%('minimum thickness of film (in metre) is',t*10**6,'');"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "minimum thickness of film (in metre) is 0.10 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file