Question

How are optical ray and wavefront related with each other?

Hint:

To understand wave behavior, remember that optical rays are always normal to wavefronts, following Huygens' principle.

Answer 1

Step 1: A wavefront represents the locus of points having the same phase in a wave. Step 2: An optical ray indicates the direction of propagation of the wave. Step 3: The optical ray is always perpendicular to the wavefront at any given point. \[ \therefore \text{The correct answer is: An optical ray is perpendicular to the wavefront.} \] \[ \boxed{\text{An optical ray is perpendicular to the wavefront}} \]