alleryBy Huygens principle the new wavefront is the common ___ to all the secondary wavelets.
ATangent
BNormal
CRadius
DCentre
Answer & Solution
Correct answer: A. Tangent
1. Each point on the old wavefront sends out a wavelet.
2. The wavelets grow to radius vt.
3. Their common tangent is the new wavefront.
_Source: syllabus Physics Part II, Chapter 10, Wave Optics._
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