Lense ea refractive index e phahame, lilense tse tšesaane, tse kholoanyane, boima le bo betere, ho fapana le hoo, index ea refractive e tlase, lense e teteaneng, e nyane haholo, boima le bona bo futsanehile, khalase e akaretsang ea boima bo phahameng, kahoo index ea refractive hangata e ka ba 1.7, 'me boima ba filimi ea resin bo futsanehile, index ea refractive e batla e le tlaase, karolo ea resin e rekisoang hona joale ke eona e tloaelehileng ka ho fetisisa ea refractive index ea 1.499 kapa ho feta, Ho molemo hanyenyane ke mofuta o fokolang haholo, e nang le index ea refractive ea hoo e ka bang 1.56 mme e boetse e sebelisoa haholo.