Question 1-1: How many wavelengths of a helium-neon laser are equivalent to 1.0 mm? Show your calculation. Prediction 1-1: Suppose that light from the helium-neon laser is aimed through a 1 mm wide slit as shown in Figure 6-1. What would you expect to see on a screen 1.5 meters away? Sketch your prediction and describe below in words how the light on the screen would be different with and without the slit. 15m Figure 6-1: Experimental setup for observing laser light through a slit. (View is from above.) To test your prediction, you will need the following: . 1-mm-wide slit and holder helium-neon laser . . screen blackboard eraser and chalk dust Activity 1-1: Light Through a Slit 1. Set up the laser, slit, and screen with the slit vertical, as in Figure 6-1. 2. Turn on the laser, and observe the light on the screen with and without the slit. You will be able to see the path of the light better if you spread chalk dust in the region between the slit and the screen