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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#10: Lasers "
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.1, Page number 10.20"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "energy gap is 0.8 eV\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "h=6.63*10**-34;      #planck's constant\n",
+    "c=3*10**8;      #velocity of light(m/s)\n",
+    "lamda=1.55*10**-6;     #wavelength(m)\n",
+    "e=1.6*10**-19;   \n",
+    "\n",
+    "#Calculation\n",
+    "Eg=h*c/(lamda*e);     #energy gap(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"energy gap is\",round(Eg,1),\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.2, Page number 10.20"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "wavelength is 8633.0 angstrom\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "h=6.63*10**-34;      #planck's constant\n",
+    "c=3*10**8;      #velocity of light(m/s)\n",
+    "Eg=1.44;     #energy gap(eV)\n",
+    "e=1.6*10**-19; \n",
+    "\n",
+    "#Calculation\n",
+    "lamda=h*c/(Eg*e);    #wavelength(m)\n",
+    "\n",
+    "#Result\n",
+    "print \"wavelength is\",round(lamda*10**10),\"angstrom\""
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}