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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

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  • $\begingroup$ 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. $\endgroup$
    – MS-SPO
    Commented May 13, 2023 at 6:32
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    $\begingroup$ @MS-SPO You can borrow the book for an hour by signing in to archive.org. Bottom of page 149. $\endgroup$
    – Farcher
    Commented May 13, 2023 at 7:07
  • $\begingroup$ see : physics.stackexchange.com/questions/665164/… and physics.stackexchange.com/questions/200145/… $\endgroup$
    – hyportnex
    Commented May 13, 2023 at 13:32

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