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{
"metadata": {
"name": "",
"signature": "sha256:483ac761a0ac81598a32958276222effb2c60791a86a62e2445fc0aaf9c0e97b"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 9 Interference"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.1 Page no 136"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"t=0.2 #Thickness of film in micro m\n",
"r=1.25 #Refractive index of liquid\n",
"w=(4000,5000) #Range of wavelength in Angstrom\n",
"q=35 #Angle observed in degrees\n",
"\n",
"#Calculations\n",
"import math\n",
"u=math.asin(math.sin(q*3.14/180.0)/r)*180/3.14\n",
"w1=(2*t*10**-6*r*math.cos(u*3.14/180.0))/10**-10\n",
"w2=w1/2.0 \n",
"\n",
"#Output\n",
"print\"Wavelength absent in reflected light is \",round(w2,0),\"Angstrom\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Wavelength absent in reflected light is 2222.0 Angstrom\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.2 Page no 136"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"r=1.39 #Refractive index of the film \n",
"q=30 #Angle observed in degrees\n",
"w=(5125,5000) #Wavelengths of two consecutive dark bands in Angstrom\n",
"\n",
"#Calculations\n",
"import math\n",
"r1=math.asin(math.sin(q*3.14/180.0)/r)*180/3.14\n",
"n=w[1]/(w[0]-w[1])\n",
"t=((n*w[0]*10**-8)/(2.0*r*math.cos(r1*3.14/180.0)))/10**-4\n",
"\n",
"#Output\n",
"print\"Thickness of the film is \",round(t,4),\"*10**-4 cm\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Thickness of the film is 7.9026 *10**-4 cm\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.3 Page no 137"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"r=1.4 #Refractive index of the material\n",
"w=5893 #Wavelength of yellow light in Angstrom\n",
"n=10 #Number of bands\n",
"w1=0.009 #Width of band in m\n",
"\n",
"#Calculations\n",
"import math\n",
"b=math.asin((w*10**-8)*180/3.14/(2.0*r*n*w1))\n",
"\n",
"#Output\n",
"print\"Angle of wedge is \",round(b,4),\"degrees\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Angle of wedge is 0.0134 degrees\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.4 Page no 137"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"r=1.0 #Refractive index\n",
"n=4 #Number of bands\n",
"w=6500 #Wavelength in Angstrom\n",
"\n",
"#Calculations\n",
"t=(((n+(1/2.0))*w*10**-8)/(2*r))/10.0**-4\n",
"\n",
"#Output\n",
"print\"Thickness of wedge shaped air film is \",t,\"*10**-4 cm\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Thickness of wedge shaped air film is 1.4625 *10**-4 cm\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.5 Page no 137"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"d=0.5 #Diameter of the ring in cm\n",
"n=4 #number of bands\n",
"w=5893 #Wavelength of light in Angstrom\n",
"q=30 #Angle at which light enters in degrees\n",
"\n",
"#Calculations\n",
"import math\n",
"R=((d**2*math.cos(q*3.14/180.0))/(2.0*(2*n+1)*w*10**-8))\n",
"\n",
"#Output\n",
"print\"Radius of curvature of lens is \",round(R,1),\"cm\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Radius of curvature of lens is 204.1 cm\n"
]
}
],
"prompt_number": 11
}
],
"metadata": {}
}
]
}
|
