The next position of a wavefront is found by drawing a common:
ANormal
BRadius
CChord
DTangent
Answer & Solution
Correct answer: D. Tangent
1. Spheres of radius v times t are drawn from each point.
2. Their common tangent is taken.
3. That tangent gives the new wavefront.
_Source: NCERT Class 12 Physics Part II, Chapter 10, Wave Optics._
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