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Lets say we have a certain wavelength $\lambda$ and a known slit width $d$, how can I calculate (approximately) the angle $\theta$ between the central maxima and the next maxima?

I know that $d \sin \theta = m \lambda$ gives the minimum (m=1 is first minimum and so on) and that I can approximate $\sin \theta \approx \theta$ but other than that I am quite stuck. How can I proceed from here and approximate the angle $\theta$?

I have seen the other thread related to this topic but I did not understand the answer there.

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Here is a good explanation from a textbook:

https://openstax.org/books/college-physics/pages/27-5-single-slit-diffraction

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