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: syllabus Physics Part II, Chapter 10, Wave Optics._

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