Geometry of Prism
Hello,
I am working on the exercises of the geometry of the prism from the optics(Essentials), and I don't understand how angle A is equal to the sum of the angles r1 and r2 in every single exercise. When I tried using the hints, this was not explained there. Could you please explain that?
This link takes you to the exercise:
Thank you for your assistance and care!
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