alleryFar from the source, a small part of the wavefront is nearly:
ABent
BPlane
CRound
DSharp
Answer & Solution
Correct answer: B. Plane
1. A sphere of very large radius is only gently curved.
2. A small patch of it is almost flat.
3. So far from the source we may treat the wave as a plane wave.
_Source: syllabus Physics Part II, Chapter 10, Wave Optics._
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