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From a distance light source, the shape ...

From a distance light source, the shape of the wavefront is……………….. .

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### Step-by-Step Solution: 1. **Understanding Wavefronts**: A wavefront is defined as the surface over which an oscillation has a constant phase. In simpler terms, it is the surface that connects all points that are in the same phase of the wave. 2. **Identifying the Source of Light**: When we consider a distant light source, the rays of light emitted from it can be assumed to be parallel due to the great distance. This is because the divergence of light rays becomes negligible at large distances. 3. **Direction of Light Propagation**: The direction in which light travels is known as the direction of ray propagation. For a wavefront, this direction is always perpendicular to the wavefront itself. ...
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