Amalensi ashintsha umbala aba mnyama lapho kukhanya ilanga. Lapho ukukhanya kuncipha, kuyakhanya futhi. Lokhu kungenzeka ngoba amakristalu e-halide esiliva ayasebenza.
Ngaphansi kwezimo ezijwayelekile, igcina amalensi esobala ngokuphelele. Lapho kuvezwa ukukhanya kwelanga, isiliva kukristalu liyahlukaniswa, futhi isiliva samahhala sakha ama-aggregate amancane ngaphakathi kwelensi. Lawa maqoqo esiliva amancane awavamile, ama-clumps axhumene angakwazi ukudlulisa ukukhanya kodwa akumunce, enze i-lens ibe mnyama ngenxa yalokho. Uma ukukhanya kuphansi, i-crystal ishintsha futhi ilensi ibuyela esimweni sayo esikhanyayo.