Izici zomkhiqizo
(1) Izinkomba Zokulinganisa ezingaphezu kuka-30
(2) Linganisa ukuthi umbala uyakhanya yini, futhi unikeze cishe imithombo yokukhanya yokuhlola engu-40
(3) Iqukethe imodi yokulinganisa ye-SCI
(4) Iqukethe i-UV yokukala umbala we-fluorescent
