Discussion
In Huygens construction, the secondary wavelets move
Answer: A
In Huygens' construction the secondary wavelets move in all directions.
Huygens' principle treats every point on a wavefront as a source of secondary wavelets that spread out in all directions at the speed of the wave. The new wavefront is the forward envelope (common tangent) of these wavelets; the backward part is simply ignored in the construction.
The wavelets are not restricted to radial, backward or perpendicular directions.
Huygens' construction explains both reflection and refraction: the envelope of the wavelets drawn from each point of an incident wavefront gives the reflected or refracted wavefront.
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