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   "source": [
    "# Chapter 23:Optical Devices"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex23.1:pg-1094"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
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   "outputs": [
    {
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     "text": [
      "The focal length of the reading glasses is f= 37.5  cm\n"
     ]
    }
   ],
   "source": [
    "  #Example 23_1\n",
    " \n",
    "  \n",
    "#To find the focal length of the reading glasses\n",
    "d1=25.0       #units in cm\n",
    "d2=-75        #units in cm\n",
    "f=(d1*d2)/(d2+d1)     #Units in cm\n",
    "print \"The focal length of the reading glasses is f=\",round(f,2),\" cm\"\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex23.2:pg-1094"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The focal length of the corrective lens is f= 50.0  cm\n"
     ]
    }
   ],
   "source": [
    "  #Example 23_2\n",
    " \n",
    "  \n",
    "  #To find the focal length of the corrective lens\n",
    "d1=-50.0           #units in cm\n",
    "f=-(d1)         #Units in cm\n",
    "print \"The focal length of the corrective lens is f=\",round(f),\" cm\"\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex23.3:pg-1095"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The combined focal length is= 0.3  cm\n"
     ]
    }
   ],
   "source": [
    "  #Example 23_3\n",
    " \n",
    "  \n",
    "#To find the focal length of the combination\n",
    "d1=20.0            #units in cm\n",
    "d2=-30.0             #units in cm\n",
    "d3=60.0           #units in cm\n",
    "p1=100/d1         #units in dipoters\n",
    "p2=100/d2         #units in dipoters\n",
    "p3=100/d3         #units in dipoters\n",
    "p=1/(p1+p2+p3)          #Units in diopters\n",
    "print \"The combined focal length is=\",round(p,1),\" cm\"\n"
   ]
  }
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