Links:
[1] https://demoweb.physics.ucla.edu/sites/default/files/Physics6C_Exp4.pdf
[2] https://demoweb.physics.ucla.edu/sites/default/files/Lab%20Hazard%20Awareness%20Information_0.pdf
[3] https://demoweb.physics.ucla.edu/sites/default/files/LASER%20LITE_0.pdf