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+{
+ "metadata": {
+  "celltoolbar": "Raw Cell Format",
+  "name": "",
+  "signature": "sha256:1b9250434a66c555344f74813ca967ce998b1c86d33424d56ca71d7c748c63ce"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 1: Interference"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1.7, Page number 1-19"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math \n",
+      "#Given Data:\n",
+      "i=30         #angle of incidence\n",
+      "u=1.43               #Refractive index of a soap film\n",
+      "lamda=6*10**-7          #wavelength of light\n",
+      "n=1                  #For minimum thickness\n",
+      "\n",
+      "#Calculations:\n",
+      "#u=sin i/sin r      #Snell's law   .So,\n",
+      "r=math.degrees(math.asin(math.sin(i)/u))    #angle of reflection\n",
+      "\n",
+      "#Now, condition of minima in transmitted system is\n",
+      "#2ut*cos(r)=(2n-1)lam/2\n",
+      "t=lamda/(2*2*u*math.cos(r))      #minimum thickness of film\n",
+      "print\"Minimum thickness of film is \",t,\"m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Minimum thickness of film is  1.09096619878e-07 m\n"
+       ]
+      }
+     ],
+     "prompt_number": 17
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1.8, Page number 1-19"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Given Data:\n",
+      "\n",
+      "lamda = 5893*10**-10      #Wavelength of light\n",
+      "theta = 1               #assuming value of theta\n",
+      "\n",
+      "#We know, B=lam/(2*u*theta). Here u=1\n",
+      "B = lamda/(2*theta)       #fringe spacing\n",
+      "n=20                  #interference fringes\n",
+      "\n",
+      "#Calculations:\n",
+      "#t=n*B*tan(theta)\n",
+      "t = 20*B*theta          #Thickness of wire\n",
+      "print\"Thickness of wire is =\",t,\"m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Thickness of wire is = 5.893e-06 m\n"
+       ]
+      }
+     ],
+     "prompt_number": 18
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file