Diffraction Single Slit

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First minimum in single slit diffraction at angle θ satisfies:

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In single slit diffraction (Fraunhofer diffraction), light waves from different parts of the same slit interfere.
- The **condition for the $n^{th}$ minimum** is: $a \sin 	heta = n\lambda$.
- For the first minimum ($n=1$): $a \sin 	heta = \lambda$.
- $a$ is the width of the slit. Note the contrast with YDSE where $d \sin 	heta = n\lambda$ is the condition for **maxima**.

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Diffraction Single Slit

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