Question

The optical analogue of an equipotential surface is

Answer 1

Explanation:

1. A surface with an equipotential potential has the same electric potential at all places on the surface.
2. This means that a charge will have the same potential energy at every point on the equipotential surface.
3. Locus of surfaces with a constant phase are known as wavefronts. The surface of wavefronts is perpendicular to the direction of propagation of light.
4. Thus, wavefronts are similar to the equipotential surfaces, as they have the same phase at each point on the chosen wavefront.

Hence, the optical analogue of an equipotential surface is wavefronts.