Question

The wavefront of distant source of unknown shape is approximately _________.

Answer 1

Wavefront:-

1. When the point source or linear source of light is very far away, just a small section of the spherical or cylindrical wavefront appears to be planar.
2. It is called a plane wavefront.
3. When we perceive a point object, it creates a spherical wavefront; but, when the same point item is far away, the rays become parallel, creating a plane wavefront.
4. The curvature of the wave fronts continues to decrease as one moves further away from the light source.
5. It will be a plane source for wave fronts approaching from a distance.
6. Hence, the wavefront of distant source of unknown shape is approximately plane.