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The answer to your question is :
Angle reflection on mirror II will be 70°.
Explaination:
In triangle ABC
Angle A + Angle B + Angle C =180° (Pythagorous Theorem)
40+70+Angle C= 180
Angle C = 180-110
Angle C= 70°
Angle C= Angle reflection on mirror II (Angle of reflection is always equal to the angle of refraction)
Angle reflection on mirror II=70°
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