here can got the expeimental details with pics of instruments to

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