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10), taHumort angle blu,the tuo PlonennLHJ toで5, a light 'soy, after yeection oncet eacRalle incident dtection

Answer»

Incident and reflected rays are parallel if 2a+2b = 180 deg.=> a+b=90 deg.angles DOE+ ODE+DEO = 180 deg90-a + 2c + 90-b = 180 deg => c = 45 deg.angle between mirrors = 2c = 90 deg.



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