Igwe anya nkuku ziri ezi na mkpuchi mkpuchi

A na-ejikarị prisms akụkụ aka nri na-atụgharị ụzọ ọkụ ma ọ bụ chegharịa onyonyo nke sistemu anya mebere site na 90°. Dabere na nhazi nke prism, ihe oyiyi ahụ nwere ike ịbụ aka ekpe na aka nri na-agbanwe agbanwe, na-agbada na elu na ala.

Prism n'akụkụ aka nri n'onwe ya nwere mpaghara kọntaktị buru ibu yana akụkụ a na-ahụkarị nke 45° na 90°. Ya mere, prism-n'akuku aka nri dị mfe ịwụnye karịa enyo nkịtị, ma nwee nkwụsi ike na ike dị mma maka nrụgide ọrụ. Ha bụ nhọrọ kacha mma maka ngwa anya maka ụdị ngwaọrụ na ngwa niile.