Ko te whakapikonga o tētahi hihi aho ina whakawhiti taua hihi mai i tētahi whaitua pūataata ki tētahi. Hei tauira, ka hakoko te hihi aho, e whakawhiti ana mai i te hau takiwā ki te wai. Ka hakoko te hihi aho nā te mea he pōturi ake te ngaru aho i roto i te wai, tēnā i te hau takiwā (RP 2009:183). / The bending of a ray of light when that ray passes from one transparent medium to another. For example, a ray of light bends when travelling from air into water. It bends because the light wave travels slower in water than it does in air (RP 2009:183)

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