Light - Reflection and Refraction

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Across
  1. 1. The distance between the pole and the principal focus of a spherical mirror is ____ length
  2. 3. SI unit of power of a lens
  3. 5. travel in straight lines
  4. 8. The angle of incidence is equal to the angle of ____
  5. 9. The absolute refractive index of a medium is simply called its ____ index
  6. 10. The centre of the reflecting surface of a spherical mirror
Down
  1. 2. The centres of these spheres are called centres of ____ of the lens
  2. 4. A material that cannot be used to make a lens
  3. 6. Mirrors, whose reflecting surfaces are spherical, are called ____ mirrors
  4. 7. A spherical mirror whose reflecting surface is curved outwards