Figure CQ19.16 shows four permanent magnets, each having a hole through its center. Notice that the blue and yellow magnets are levitated above the red ones. (a) How does this levitation occur? (b) What purpose do the rods serve? (c) What can you say about the poles of the mag- nets from this observation? (d) If the upper magnet were inverted, what do you suppose would happen?
Physics 213 // Week 3 Notes PSU Spring Term, 2017 _______ = Formula Chapter 34 Notes Q: What is an image (relating to images of physics) A: An image is a reproduction of an object via light. Q: How can we relate the object’s distance to a mirror and the reflected image A: = − (plane mirror formula) i = image distance (meters) p = distance from object to mirror (meters) Q: How can you tell if an image is virtual A: If ‘i’ is negative (-i) then the image is virtual. If ‘i’ is positive (+i) then the image is real. Q: Can a convex mirror form a real image A: No! Convex mirrors can only form virtual images. Q: Can a concave mirror form a real image A: Y
