Question

According to Huygen's principle, secondary wavelets move:

• A. Forward
• B. In all directions
• C. In a circular motion
• D. Backward

Hint:

According to Huygen's principle, each point on a wavefront acts as a source of secondary wavelets that propagate in all directions.

Answer 1

The Correct Option is B

According to Huygen's principle, every point on a wavefront can be considered as a source of secondary wavelets that spread out in all directions. The new wavefront is formed by the surface tangent to these secondary wavelets. Thus, the secondary wavelets move in all directions from each point on the wavefront. Therefore, the correct answer is: \[ \boxed{(B) \, \text{In all directions}} \]