In order the construct the reflected wavefront we draw a sphere of radius vr from the point A. If ‘ v ‘ represents the speed of the wave in the medium and if ‘ r ‘ represents the time taken by the wavefront from the point B to C then the distance ![]() ![]() These incident wavefront is carrying two points, point A and point B, so we can say that from point B to point C light is travelling a distance. If we draw a perpendicular from point ‘A’ to this ray of light, Point A, and point B will have a line joining them and this is called as wavefront and this wavefront is incident on the surface. As these rays are incident from the surface, so we call it incident ray. Plane AB is incident at an angle ‘ i ‘ on the reflecting surface MN. ![]() We can see a ray of light is incident on this surface and another ray which is parallel to this ray is also incident on this surface.
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