noun (n)

• the change in direction of a propagating wave (light or sound) when passing from one medium to another

  perubahan dalam arah yang propagating gelombang (cahaya atau suara) ketika diteruskan dari satu medium lain

  source: wordnet30
• the amount by which a propagating wave is bent

  jumlah oleh mana propagating gelombang dibengkokkan

  Synonym:
  deflection, deflexion
  

  source: wordnet30
• The act of refracting, or the state of being refracted.

  tindakan refracting, atau keadaan menjadi refracted.

  source: webster1913