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It is the figure. When 2 mirrors are placed at right angles, then the incident ray is parallel to reflected ray. According to law of reflection angle of incidence is equal to angle of reflection, so angle of reflection for 1st mirror is 30 degree. Through co interior angle property find the other co interior angle and divide by 2. You'll get angle of reflection for 2nd mirror. It is 60 degree. Check it and mark my answer as brainliest please. Thanks.
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