Glass and paint

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Across
  1. 4. The speed of something in a given direction
  2. 7. A line drawn perpendicular to the interface of the surfaces of two different media
  3. 8. Allowing light to pass through so that objects behind can be distinctly seen
  4. 10. A halo-like ring that appears around the edge of glass when placed in a liquid medium with a refractive index that differs from the refractive index of the glass
  5. 14. chemical name for silica
  6. 15. If glass pieces are large enough to handle, they are fitted together as in a jigsaw puzzle. If the unique stress fractures along the edges of both glass fragments align, then the fragments are considered to be from the same piece of glass
Down
  1. 1. Light travels fastest in this medium
  2. 2. The change in the direction of light as it changes speed when moving from one substance into another
  3. 3. The most prevalent type of glass, used for windowpanes and glass containers for beverages, food, and some commodity items
  4. 5. The ratio or mass of an object to its volume
  5. 6. Fragments of glass left on the side of an impact
  6. 9. If the bullet enters from this direction, there will be short, radial fractures on the right and longer fractures on the left
  7. 11. Without a clearly defined shape or form
  8. 12. If the bullet enters from this direction, there will be short, radial fractures on the left and longer fractures on the right
  9. 13. A hard, transparent, amorphous, brittle solid made by heating a mixture of silica and other materials