None. They are the same angle.
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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.
Well it actually imposible to solve that!It will take an angel to solve that!
angel! get it.... attractive angle angel
Subtract the angel you know from 180 degrees. The answer is its supplement.
Not sure about an angel, but an angle of 159 degrees is an obtuse angle.