White light is refracted by the triangular prism shown in the figure below. A beam of light enters the prism along a path parallel to the prism base. The light is observed on a screen that is located away from the prism and is perpendicular to the emerging rays. How far apart on the screen are the spots of blue light ( ) and red light ( )

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I'm just confused as to how you're supposed to find the distance between the spots!

I've set up the problem like so:

Now that I've found the angles, how do I find the distance? >.<

Work below (if you care):

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