Question

What type of wavefronts are associated with a source infinity?

Options

• Cylindrical wavefronts

• Plane wavefronts

• Spherical wavefronts

• All types of wavefronts

Answer 1

Plane wavefronts

Explanation:

A distant source is so far away that it is thought to be infinity. Rays traveling from a distant light source are assumed to be planes moving in the direction of wave propagation, and so the wavefront is a plane wavefront.