Redraw the following diagram on your answer sheet and show the path of the reflected ray. Also mark the angle of incidence $(\angle\text{i})$ and the angle of reflection $(\angle\text{r})$ on the diagram.
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When a ray of light passes through the focus of a concave mirror then it becomes parallel to the principal axis. Here incident ray AE is passing through the focus F of concave mirror and strikes the mirror at E, then it gets reflected through path EG parallel to the axis. Also, Angle of incidence = angle of reflection$\angle\text{i}=\angle\text{r}$
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