Refraction of light

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Across
  1. 4. _ ray shows the direction in which light falls on the boundary of the two optical media.
  2. 5. A pencil half-submerged in water may appear broken because light travels _ in water.
  3. 7. The bending of light as it passes from one transparent material to another of a different optical density.
  4. 10. What does 'n' stand for? ( _ index )
Down
  1. 1. A medium with a refractive index of 2.4.
  2. 2. The change in speed as a ray of light travels from one material to another causes it to _.
  3. 3. Light bends _ the normal when entering an optically denser medium.
  4. 6. _ ray shows the direction of light after refraction.
  5. 8. The speed of light in a _ is 300,000 kilometers per second.
  6. 9. Light travels slower in an optically _ medium.