**Huygens' principle** states that every point on a wavefront acts as a:

Question

Accepted Answer

B. Secondary source emitting wavelets in all directions

Each point on a wavefront becomes a secondary source of spherical wavelets.
The new wavefront at a later time is the **envelope** of these wavelets in the forward direction (backward wavelets are taken as ineffective).

Answer

Source of plane waves only

Answer

Absorber of waves

Answer

Source of longitudinal waves only

Huygens' principle states that every point on a wavefront acts as a:

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