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I pasted the whole fragment from the book "Teaching Physics by Laurance Viennot". I generally understand this fragment. However, I am not sure if I understand what author means by the phase at each of those points then has to be readjusted in order for a geometrical optical treatment to be applied to that "object". I circled that fragment with blue. Can you give me more guidance how to understand that?

Teaching Physics by Laurance Viennot

Qmechanic
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Lukasz Skowron
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  • As I understand the authors argument, if we consider the object plane as being in-phase, the former assumption of starting in-phase everywhere at the source can‘t hold: „rays“ have paths of different length. // This perspective may be useful when looking at the overall journey of said book, which I can‘t check. – MS-SPO May 13 '23 at 06:32
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    @MS-SPO You can borrow the book for an hour by signing in to archive.org. Bottom of page 149. – Farcher May 13 '23 at 07:07
  • see : https://physics.stackexchange.com/questions/665164/why-do-we-consider-the-optical-path-length-constant-in-a-cartesian-oval/665259#665259 and https://physics.stackexchange.com/questions/200145/what-is-really-a-light-ray/200183#200183 – hyportnex May 13 '23 at 13:32

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