[3) Measure the distance between the arrow and the lens {object distance [1} and the distance from the lens to the image of the arrow {image distance q}, with the image in focus. [4) Using the lens equation, calculate the focal length [f] of the lens. Show all your work in your write up [data pages report file). [5) Move the arrow to a different distance {such as 250 or 35C! or 50 units} from the lens and repeat steps {3] and (4), using a different distance between the arrow and lens. That is. use a different object distance p, and see how the image distance, q, also changes (This is the 2st Measurement]