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two planned mirror are in perpendicular and normal ray are meet at 90°
now,angle P=90
angle 2+3=90°
angle1+2=90°
angle 3+4=90°
so, CA is parallel to ray BD
now,angle P=90
angle 2+3=90°
angle1+2=90°
angle 3+4=90°
so, CA is parallel to ray BD
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