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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:2c7fa5f48e2180e437af8892520159f12789c250e22a9e424719ad83f83b7fff"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter6-Properties of Light"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg124"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "##Example 6.1\n",
+      "##Optical path calculation \n",
+      "\n",
+      "##given values\n",
+      "n=1.33;##refractive index of medium\n",
+      "x=.75;##geometrical path in micrometre\n",
+      " ##calculation\n",
+      "y=x*n;##\n",
+      "print'%s %.3f %s'%('optical path  (in micrometre) is:',y,'')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "optical path  (in micrometre) is: 0.998 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2-pg137"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "##Example 6.2\n",
+      "##Coherence length calculation \n",
+      "\n",
+      "##given values\n",
+      "l=1*10**-14.;##line width in metre\n",
+      "x=10.6*10**-6.;##IR emission wavelength in metre\n",
+      " ##calculation\n",
+      "y=x**2./l;##\n",
+      "print'%s %.1f %s'%('coherence length(in metre) is:',y,'')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "coherence length(in metre) is: 11236.0 \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file