Interference and diffraction problems involving slits includes a lot of geometry and trig right? I'm having a hard time deriving the equtions: [tex]d sin \theta=m \lambda[/tex] and [tex]y=\frac{m\lambda L}{d}[/tex] because there are some many geometry stuff you need to do to connect the angles.(adsbygoogle = window.adsbygoogle || []).push({});

Can someone explain to me why [tex] tan\theta=sin\theta[/tex] if theta is small? thanks

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# Homework Help: Trig problems (Interference/diffraction and slits))

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