Fresnel & diffraction
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Fresnel & diffraction

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here can got the expeimental details with pics of instruments to

here can got the expeimental details with pics of instruments to

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  • 1. Determine the wavelength and thickens of wire by using sodium lamp and by Fresnel biprism and diffraction respectively
    Trisha Banerjee @ 2010
  • 2. Whole setup foe deterring the wavelength of sodium ligh by Fresnel's biprism
    Slit ( source)
    Biprism ( two virtual souse)
    Stand for lens
    Optical bench
    Trisha Banerjee @ 2010 2010
  • 3. Whole setup for determining the diameter of wire by using difrractionin shadow region phenomenon:-
    slit
    source
    Stand for wire
    Screen or eyepiece
    Trisha Banerjee @ 2010
  • 4. SLIT:-
    Screw to setup the slit axis ( i.e. parallel to wire)
    Slit opening
    Screw to adjust the width of the slit
    Screw to adjust the height of the slit
    Trisha Banerjee @ 2010
  • 5. Biprism stand:-
    Screw to adjust the axis of Biprism
    Screw to inset the Biprism properly
    Biprism
    Screw to adjust the height of the biprism
    Tangent screw (to remove the lateral shift of the fringe pattern).
    Trisha Banerjee @ 2010
  • 6. Wire Stand:-
    Screw to adjust the axis of the wire
    Wire to measure the diameter
    Screw to fit the wire stand
    Optical bench
    Tangent screw.
    Trisha Banerjee @ 2010
  • 7. Screen:-
    Micrometer reading
    Screw to rotate the micrometer
    Ramsden’s eyepiece( screen to see the fringes)
    Main scale reading
    Screw to adjust the upright position of screen.
    Trisha Banerjee @ 2010
  • 8. To remove the bench error:-
    Measuring rod
    stand
    slit
    Trisha Banerjee @ 2010
  • 9. How to remove the bench error:-
    first of all measure the length of rod by optical bench and by scale both.
    scale measure the actual length and optical bench measure the apparent one.
    then find the error.
    Precautions:-
    Always first remove the lateral shift then onwards perform the experiment.
    Trisha Banerjee @ 2010