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According to Huygens principle the phase difference between oscillations of any two particles on a same wave front is ________ rad.

Asked in GUJCET 2026 · Wavefronts and Huygens construction

Answer: (2) 0

Step-by-step solution

Idea: a wavefront is defined as the locus of the points that are all in the same phase of oscillation at a given instant.

Huygens' construction rests on exactly that: every point of a wavefront is taken as a fresh source of secondary wavelets, and they all start together because they are all in step.

So any two particles picked anywhere on one wavefront are at the same stage of their oscillation.

The phase difference between them is therefore 0 rad.

Why the other options are wrong

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