Questions:
1. Find the average focal length, and the % Error between the average and the theoretical focal length of 75 mm.
2. Why could you not obtain a focused image for some object distances? Draw a ray diagram to show the image when the object is placed at 75 mm.
3. What would the object distance need to be in order to obtain a magnification of -1? Explain by using lens equation.
4. For a converging lens of focal length f, where would you place the object to obtain an image as far from the lens as possible?
5. If you have a focused image for a converging lens of a slide projector and you move the viewing screen toward the lens, which way should you move the lens in order to restore the image to a sharp focus? Explain.