S22 PHY-252 Lab 9 Instructions_ADA_co

Lab 9 Snell’s Law Objectives  Understand Snell’s Law.  Use Snell’s Law leads to find the index of refraction for water.  Determine the critical angle for water. Materials  Semi-circular water dish with a protractor imprinted on the bottom  Protractor  Laser (w/ batteries installed)  Paper  Tape Safety Precautions In this lab you will be using a 1 mW red laser pointer. Lasers should never be pointed into the eyes of another person. Never look directly into the oncoming beam as this might cause eye damage. Read the   ENTIRE   warning label on the laser pointer. Copy down - in the beginning of your lab report - the full text of the warning sticker label affixed on the laser pointer. Follow all safety recommendations. Please remove the batteries after you performed the experiment. Procedure 1. Follow the steps in the video: https://www.youtube.com/watch?v=AcHDTHK7C5A&ab_channel=ThomasKHemmick to create the setup for our experiment. Question 1 : What are the steps of the setup procedure you followed? Please list all the steps. 2. Watch video: https://www.youtube.com/watch?v=3nNsSi1eMGg&ab_channel=ThomasKHemmick and follow the steps for finding the angle of refraction corresponding to each of the four prescribed angles of incidence in Table 9.1. When you measure the angles, make sure the two protractors are correctly aligned, as shown in Figure 9.1 We will use to find the index of refraction of the water based on Snell’s Law, n 1 sin  1 = n 2 sin  2 . (1) In the case of our experiment, medium 1 is water, n 1 = n and medium 2 is air, n 2 =1. As a result, the equation expressing Snell’s Law becomes: n sin  1 = sin  2 . (2) 3. Using Excel calculate sin  1 and sin  2 and enter these values in the corresponding cells of Table 9.1. The filled in Table 9.1 will be Table LR 9.1 in your lab report. _____________________________________________________________________________________ Spring 2022 PHY-252 Lab Manual Prof. Ciocan Lab 9 page 1 of 3