4. From your answers to the above questions as well as from the data you took, it may become clear why the lens settings of a good camera the distances are usually given as 2 ft., 4 ft., 6 ft., 10 ft., 20 ft. Why don't the distance settings continue on to 30 ft., 40 ft., etc?
5. You used two procedures for determining the focal length of a positive lens. Comment on the relative accuracy of the various procedures. If one uses the procedure of finding the focal length by focusing a distance object, the value for f might be expected to be slightly in error. Would you expect it to be too large or too small? Did it work out that way in your data?
