As light passes through a prism, it is bent, or refracted, by the angles and plane faces of the prism and each wave-lengthof light is refracted by a slightly different amount.
ﻋﻨﺪﻣﺎ ﻳﻤﺮ اﻟﻀﻮء ﻋﱪ ﻣﻨﺸﻮر زﺟﺎﺟﻲ، ﻳﻨﻜﴪ أو ﻳﻨﺤﺮف ﺑﺴﺒﺐ اﻟﺰواﻳﺎ واﻷﺳﻄﺢ اﻟﻤﺴﺘﻮﻳﺔ ﻟﻠﻤﻨﺸﻮر، وﻳُﻜﴪ ﻛﻞ ﻃﻮل ﻣﻮﺟﻲ ﻣﻦ اﻟﻀﻮء ﺑﺰاوﻳﺔ ﻣﺨﺘﻠﻔﺔ ﻗﻠﻴﻼ ً ﻋﻦ اﻷﺧﺮى.
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