physics crossword

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Across
  1. 2. SI unit of power of lens
  2. 5. medium the ratio of speed of light in vacuum to that in the medium is the refractive index of__________
  3. 6. of the object ratio of height of image and the height of object
  4. 8. rarer medium medium in which speed of light is more
  5. 9. of light the phenomenon of bending of light as it passes from one medium to another
  6. 10. the capacity of a lens to converge/diverge rays falling o it
Down
  1. 1. the size of image formed by concave lens when object is between infinity and optical centre o of the lens
  2. 3. glass slab medium in which refraction takes place both at glass interface and air glass interface
  3. 4. a transparent material bound by two surface of which one or both the surfaces are spherical
  4. 7. focus of a diverging lens point from which a beam of light parallel to principal axis after refraction appears to diverge