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I need a detailed answer of the question Classical derivation of first and second minima in Single slit diffraction

My questions are

First why for 1st minima we divide the length a into 2 parts and why into 4 parts for 2nd minima and so on

My second question is that for destructive interference why are we taking the path difference to be $\lambda/2$ be it 1st or 2nd minima why not $(2n-1)\lambda/2$ for n being a natural number

I've searched a lot over the internet it's been more than 1hr 20 min and I'm unable to find an explanation from myself please help me I'm extremely confused regarding this.

Thankyou.

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  • $\begingroup$ Is there some problem with question? That I'm getting no answers? $\endgroup$
    – Anonymous123
    Commented Sep 16 at 13:39

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