Viteza luminii in

- Vid: 299.792.458 m/s

- Aer: 299.702.547 m/s

- Diamant: 124.034.943 m/s

- Apa: 228.849.205 m/s

- Gheata: 228.849.205 m/s

- Alcool etilic: 220.435.631 m/s

- Plexiglas: 198.538.052 m/s

- Sare (NaCl) : 194.670.427 m/s

- Sticla: 197.231.880 … 180.597.866 m/s

- Zircon: 156.141.905 m/s

- Bioxid de titaniu (in stare nativa): 103.127.781 m/s

- Fosfat de Galiu  (GaP) : Lumina Vizibil – 88.959.186 m/s , Infrarosu – 93.685.143 m/s  (variabil in fuctie de frecventa)