A prism can help us understand the refraction and the reflection of light when it asses between 2 different mediums ( from one medium into another less refractive or from one medium into another more refractive ) and the ray of light may emerge out of the prism by refraction or by reflection and sometimes by total internal reflection ( by obeying the 2 laws of reflection and by making the angel of incidence equal to the angle of reflection ) and sometimes it may continue its path without deviation that is when the angle of incidence is equal to 0 degrees then the angle of refraction will be equal to 0 degrees this is called undeviated !
It separates the wavelengths contained in a beam of light.
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It depends on the prism. Is it a triangular prism, a rectangular prism, a pentagonal prism... etc..
Triangular Prism Rectangular Prism Polygonal Prism Hexagonal Prism
an oblique prism is slanted and a regular prism is not, its right.
A rectangular prism has 6 faces while a hexagonal prism has 8 faces.
is a sphere a prisam