I-prism, into esobala ezungezwe izindiza ezimbili eziphambanayo ezingahambelani, isetshenziselwa ukuhlukanisa noma ukuhlakaza imishayo yokukhanya. Amaprism angahlukaniswa abe amaprism angamanxantathu alinganayo, amaprism angama-rectangular, nama-pentagonal prism ngokwezindawo zawo kanye nokusetshenziswa kwawo, futhi avame ukusetshenziswa kumishini yedijithali, isayensi nobuchwepheshe, kanye nemishini yezokwelapha.