why does light reflect in the same way it incidents on principal axis?
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The reason for light falling on the centre of curvature gets reflected back along the same path is due to the angle of incidence and the angle of reflection lie along the normal for a concave mirror. ... Hence, the angle of reflection tends to zero degree, thus the ray of light retraces its path.
Explanation:
light rays goes parallel to principal Axis after reflection when light source is placed at focus
this can be understood
when we imagine concave mirror on a large scale and when you view a very small part of a mirror it will appear as a plane mirror
so the light source at the focus hits the concave mirror and according to law
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