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In activity shown below ,for an incident ray of light,if light source is rotated by an angle Ѳ,then by what angle will be the reflected ray rotated. |
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Answer» 2 times the angleExplanation:Construct a normal initially.Now rotate the mirror by an ANGLE a clockwise notice that the new normal is at an angle a(clockwise) with OLD normal.Now check the inital angle of incidence of the light ray with I mirror , let it be b intial angle of reflection is b anticlockwise with initial normal.new angle between the normal and ray will be C = b - aangle of reflection is also c anticlockwise with respect to new normal but new normal is an angle a clockwise with respect to old normal .after all this it is simple , see all the LINES , use angle sum property , and see for yourself . |
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