Wavefront is the locus of all points, where the particles of the medium vibrate with the same

Options

A. phse
B. amplitude
C. frequency
D. period

Explanation

To solve the question regarding the definition of a wavefront, let's break it down step by step.

### Step 1: Understanding the Concept of Wavefront
A wavefront is defined as the locus of all points in a medium that vibrate in unison, meaning they are at the same phase of vibration. This can be visualized as a surface over which the wave has a constant phase.

### Step 2: Visualizing the Wavefront
Imagine a point source of light emitting waves in all directions. As these waves propagate, they form concentric spheres around the source. Each point on the surface of these spheres represents a location where the particles of the medium (like air or water) are vibrating together at the same time.

### Step 3: Identifying the Characteristics of Wavefronts
- **Same Phase**: All points on a wavefront are at the same phase of their oscillation. This means that if one point is at the crest of a wave, all other points on that wavefront are also at the crest.
- **Locus of Points**: The wavefront can be considered as the collection of all these points that share the same phase.

### Step 4: Conclusion
Based on the definition and the visualization, we can conclude that a wavefront is indeed the locus of all points where the particles of the medium vibrate with the same phase.

### Final Answer
Wavefront is the locus of all points where the particles of the medium vibrate with the same **phase**.

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