Question

Relation between ray and wavefront is ______.

Options

• Rays are parallel to wavefront

• Rays are at acute angle to wavefront

• Rays are tangential to wavefront

• Rays are perpendicular to wavefront

Answer 1

Relation between ray and wavefront is rays are perpendicular to wavefront.

Explanation:

The new wavefront is the forward envelope of the secondary waves, according to Huygens' architecture. Secondary waves are spherical when the speed of light is independent of direction. The rays are perpendicular to the wavefronts at this point.