Reading Guide — Chapter 27 — Light Name: Period: Pre-reading: What is light, and how does light travel? Read the introduction and section 1. What is light and how does light travel? How fast does light travel? Read section 27.3. List 5 types of electromagnetic waves. Circle the ones on your list you use on a regular basis. Are electromagnetic waves longitudinal or transverse? Read 27.4. UV cannot pass through glass. Where does this energy go? Read p 409, provide a SIMPLE definition of what it mean to be transparent? Read 27.5. When light is shined on an opaque material what two things can happen to the light? The change in the speed of light as it moves from one transparent material to another causes what? In section 27.6, it talks about shadow formation. In what situation do shadows appear sharp and when do they look blurred? Read section 27.7 on polarization. If light travels forward as a wave in all directions, how many directions of light will pass through undisturbed in a good pair of sunglasses? (Draw a picture!!!) How do you orient polarizing filters to prevent light from passing through? Why do sunglasses containing polarizing filters that are aligned vertically? Just for fun. Check out the optical illusions and 3-d images on p. 417-418.