A glass ball with a shiny coating acts like a mirror (see the figure to the right). The
ball has a diameter of 10 cm. You hold the
ball away from you at arm's length and look
at your reflection. If the nose on your face is
1.1 meters from the mirror surface, calculate
the image distance and the Magnification.

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.