Across
- 2. heating foods
- 5. picture from mirror.
- 9. curving outward.
- 10. light through a prism into 7 coulors
- 13. wave from the Sun conclude 7 waves .
- 14. transfer signal of cell phone.
- 15. distance move in a wave
Down
- 1. light beside purple light .
- 3. light hit a surface and return back
- 4. light spread out or bend when it pass through a slit or an obstacle.
- 6. numbers of waves in one second .
- 7. curving inward.
- 8. light beside red light.
- 11. light pass through different medium and bend
- 12. not real.