Light

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 1. The innermost light-sensitive membrane covering the back wall of the eyeball (6)
  2. 4. To increase in size, volume or significance (10)
  3. 6. What lets us see; the opposite of dark (5)
  4. 7. A small portable battery-powered electric lamp (10)
  5. 8. Not transmitting or reflecting light or radiant energy (6)
  6. 10. The transmission of light signals via glass fibers (11)
  7. 11. The organ of sight (plural) (6)
  8. 13. A brittle transparent solid with irregular atomic structure (plural) (7)
  9. 15. Shade within clear boundaries (6)

Down

  1. 2. So thin as to ___ light (11)
  2. 3. An electrical device that alters the frequency spectrum of signals passing through it (6)
  3. 5. The amount of electromagnetic radiation leaving or arriving at a point on a surface (7)
  4. 9. One celestial body obscures another (plural) (8)
  5. 10. To pay close attention to one thing (5)
  6. 12. A circular segment of a curve (4)
  7. 14. Curved glass that bends light in glasses and cameras (4)