Refraction

• A light ray bends toward the normal when it enters a glass block.
• The light ray bends away from the normal when it exits the glass block.
• The ray exiting the glass block is parallel to the ray entering it.
• The greater the density, the slower the speed.
• What is the least densest substance/object that light can pass through:

  1. Air
  2. Glass
  3. Diamond