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diff --git a/Applied_Physics_II/Chapter_4.ipynb b/Applied_Physics_II/Chapter_4.ipynb
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--- a/Applied_Physics_II/Chapter_4.ipynb
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@@ -1,141 +0,0 @@
-{
- "metadata": {
-  "name": ""
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter 4: Lasers"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 4.6.1, Page number 4-7"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "\n",
-      "#Variable declaration\n",
-      "P = 3.147*10**-3     #output power(W)\n",
-      "t = 60               #time(sec)\n",
-      "lamda = 632.8*10**-9 #wavelength(m)\n",
-      "h = 6.63*10**-34     #Planc's constant(J-s)\n",
-      "c = 3*10**8          #velocity of light(m/s)\n",
-      "\n",
-      "#Calculations\n",
-      "N = (P*t*lamda)/(h*c)\n",
-      "\n",
-      "#Result\n",
-      "print \"No. of photons emittd each minute is\",round(N/1e+17),\"*10^17\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "No. of photons emittd each minute is 6.0 *10^17\n"
-       ]
-      }
-     ],
-     "prompt_number": 2
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 4.6.2, Page number 4-7"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "\n",
-      "import math\n",
-      "\n",
-      "#Variable declaration\n",
-      "T = 300              #temperature(K)\n",
-      "lamda = 694.3*10**-9 #wavelength(m)\n",
-      "h = 6.63*10**-34     #Planc's constant(J-s)\n",
-      "c = 3*10**8          #velocity of light(m/s)\n",
-      "k = 1.38*10**-23     #Boltman's constant(J/K)\n",
-      "\n",
-      "#Calculations\n",
-      "N2_by_N1 = math.exp((-h*c)/(lamda*k*T))\n",
-      "                    \n",
-      "#Result\n",
-      "print \"Ratio of population =\",round(N2_by_N1/1e-31,3),\"*10^-31\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "Ratio of population = 8.874 *10^-31\n"
-       ]
-      }
-     ],
-     "prompt_number": 4
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 4.6.3, Page number 4-8"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "\n",
-      "#Variable declaration\n",
-      "P = 100*10**3        #output power(W)\n",
-      "t = 20*10**-9        #time(sec)\n",
-      "N = 6.981*10**15     #no. of photons\n",
-      "h = 6.63*10**-34     #Planc's constant(J-s)\n",
-      "c = 3*10**8          #velocity of light(m/s)\n",
-      "\n",
-      "#Calculations\n",
-      "lamda = (N*h*c)/(P*t)\n",
-      "\n",
-      "#Result\n",
-      "print \"Wavelength =\",round(lamda/1e-10),\"A\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "Wavelength = 6943.0 A\n"
-       ]
-      }
-     ],
-     "prompt_number": 8
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file