Question

What role does each point of a spherical wavefront play in constructing its later position?

Options

• It acts as a common tangent to all spheres.

• It acts as a ray normal to both wavefronts.

• It acts as the centre of the new spherical wavefront.

• It acts as the source of a secondary disturbance.

Answer 1

Each point of the spherical wavefront acts as the source of a secondary disturbance. The resulting secondary wavelets are used to find the later wavefront.