Across
- 4. clear
- 7. unclear
- 8. negative-lens
- 9. split
- 11. particle
- 13. shade
- 14. positive-lens
- 16. bend
- 18. Microwave
- 19. mirror
- 20. bouncing
Down
- 1. scatter
- 2. focus
- 3. tissue
- 5. separate
- 6. Radiation
- 10. fisheye-mirror
- 12. focusing-mirror
- 15. beam
- 17. transmission