Physics prism problem....?

In coming and out going rays have same angle

White common encompasses a sort of colorations. for each wavelength, there's a various physique of ideas of refraction at the same time because it enters the prism. at a similar time as passing by using utilising the prism, the colorations will save on with unparallel paths. yet as immediately as they attain the exterior going lower back to the formed medium (in many circumstances the air) each and each color refracts as immediately as extra effective. the physique of ideas is an comparable physique of ideas, regardless of if with a minus sign. In a prism the two surfaces are no longer parallel, so the colorations head off at an physique of ideas to the standard course inspite of the shown fact that the colors are lower back parallel. If somewhat of a prism, they went by using way of way of a thick piece of glass, then they each and each return to the easy compass heading - basically offset to the ingredient relatively.