The idea of secondary wavelets for the propagation of a wave was first given by

Options

A. Newton
B. Huygens
C. Maxwell
D. Fresnel

Answer

To solve the question regarding who first proposed the idea of secondary wavelets for the propagation of a wave, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Wavelets**:
- A wavelet is a small wave or a secondary wave that is generated from a primary wave front. It represents the idea that waves can propagate from a source by creating smaller waves.

2. **Definition of Wavefront**:
- A wavefront is defined as the locus of all points that are in the same phase of oscillation. It is the surface over which the wave has a constant phase.

3. **Huygens' Principle**:
- The concept of secondary wavelets is encapsulated in Huygens' Principle, which states that every point on a wavefront can be considered as a source of secondary wavelets. These wavelets spread out in the forward direction at the same speed as the original wave.

4. **Historical Context**:
- The idea of secondary wavelets and the propagation of waves was first introduced by the Dutch scientist **Christian Huygens** in the 17th century.

5. **Conclusion**:
- Therefore, the answer to the question is that the idea of secondary wavelets for the propagation of a wave was first given by **Christian Huygens**.

### Final Answer:
The idea of secondary wavelets for the propagation of a wave was first given by **Christian Huygens**.

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