JEE Advanced 2013 Physics question
A ray of light travelling in the direction is incident on a plane mirror. After reflection, it travels along the direction . The angle of incidence is
Answer: (A)
Solution
On reflection the component of the direction parallel to the mirror is unchanged and the normal component is reversed. Here the x-component (1/2) is unchanged and the y-component changes from to , so the normal to the mirror is along
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