Procedure: (1) Go to: https://phet.colorado.edu/en/simulation/geometric-optics (2) Click on the 'Play' button for the simulator. Choose Lens and play again. You will see a lens, a pencil in a frame to the left and the image of the pencil created by the lens on the right. You will also see a green box at the bottom of your screen with controls for the simulation. (3) In the top right corner of the screen, you will see rulers - you will need the horizontal one first. Record Data in Tables at the bottom!! TABLE 1: parts (4) - (7) (4) Measure the distance between the center of pencil and the lens (object distance p) and the distance from the lens to the center of the image of the pencil (image distance q) (the image is in focus) (5) Using the lens equation, calculate the focal length () of the lens. Show all your work. Example: | measure p = 20cm, and q = 30cm F = (p x q)/ (ptq) = (20 x 30) / (20 + 30) = 600 / 50 = 12cm (6) Move the pencil to a different distance from the lens and repeat steps (4) and (5), using a different distance between the pencil and lens. That is, use a different object distance p. (7) Calculate the average value of the focal length (f) of your lens for the two sets of measurements