15. Waves, optics, quantum

• 15.1. Light in darkness
• 15.2. Reflection
• 15.3. Making Einstein young again
• 15.4. Surprising infra-red investigations
• 15.5. LEDs and photons
• 15.6. Writing with a laser using phosphorescence
• 15.7. Shadow of a flame 1
• 15.8. Shadow of a flame 2
• 15.9. Standing wave with an electric toothbrush
• 15.10. Physics of the panflute
• 15.11. Ranking the ‘stars’
• 15.12. Singing rod
• 15.13. Bouncing ball in a tube
• 15.14. Fluorescent olive oil
• 15.15. Hot spots in the microwave
• 15.16. Strange shadows
• 15.17. Cold radiation
• 15.18. Captured laser beam