You have just been given a 3X magnifying lens as a present. Magnifying glasses arc often use to burn ants on a sunny day.
1) If the focal length of the lens is 6, how far from the ant should the lens be held?
2) If instead you use the magnifying glass to examine a small object, what is the correct objects distance to obtain the stated magnification?
3) How far away does the image appear to you?