Gupfundikanya cyangwa gusiga irangi hamwe nibintu byiza bya optique bigaragarira muburebure bwumurongo wimbaraga kandi bikagaragarira kubandi.Ubusanzwe ibifuniko byatoranijwe bitagaragara neza kumucyo ugaragara kandi byerekana imirasire ngufi-ndende na radiyo ndende.