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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