[header] How to perform young's double slit experiment [title] Set up the optics bench : [substeps] Begin with the optics bench in front of you with the 0 centimeter (0.0 in) mark on your left. Install the diode laser at the 0 centimeter (0.0 in) mark facing towards the right. This should require little effort. 
Mount the multi-slit apparatus to its appropriate mount. This may require some force and will make a clicking sound when properly installed.