Reflection and Refraction

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Across
  1. 1. Mirror with a reflective surface curving outward (8 letters)
  2. 4. The bouncing back of light from a surface (10 letters)
  3. 6. Bending of light as it passes from one medium to another (10 letters)
  4. 8. The angle of incidence is equal to the angle of (9 letters, two words)
  5. 10. A lens that is thicker in the middle and converges light (6 letters)
Down
  1. 2. Measure of much a medium slows down light (8 letters, two words)
  2. 3. Imaginary line perpendicular to the surface at the point of incidence (6 letters, two words)
  3. 5. The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant (6 letters, two words)
  4. 7. Mirror with a reflective surface curving inward (7 letters)
  5. 9. The point where refracted rays converge or appear to diverge from in a lens (5 letters)