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# Fresnel & diffraction

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here can got the expeimental details with pics of instruments to

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### Fresnel & diffraction

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